diff --git a/dist/vue-i18n.common.js b/dist/vue-i18n.common.js
index ac1357c4b..d08d09fc5 100644
--- a/dist/vue-i18n.common.js
+++ b/dist/vue-i18n.common.js
@@ -22,7 +22,8 @@ var numberFormatKeys = [
   'minimumSignificantDigits',
   'maximumSignificantDigits',
   'localeMatcher',
-  'formatMatcher'
+  'formatMatcher',
+  'unit'
 ];
 
 /**
diff --git a/dist/vue-i18n.esm.browser.js b/dist/vue-i18n.esm.browser.js
index 852336a36..d223463aa 100644
--- a/dist/vue-i18n.esm.browser.js
+++ b/dist/vue-i18n.esm.browser.js
@@ -15,7 +15,8 @@ const numberFormatKeys = [
   'minimumSignificantDigits',
   'maximumSignificantDigits',
   'localeMatcher',
-  'formatMatcher'
+  'formatMatcher',
+  'unit'
 ];
 
 /**
diff --git a/dist/vue-i18n.esm.browser.min.js b/dist/vue-i18n.esm.browser.min.js
index 2086d44e8..f54c6d7e0 100644
--- a/dist/vue-i18n.esm.browser.min.js
+++ b/dist/vue-i18n.esm.browser.min.js
@@ -1 +1 @@
-const t=["style","currency","currencyDisplay","useGrouping","minimumIntegerDigits","minimumFractionDigits","maximumFractionDigits","minimumSignificantDigits","maximumSignificantDigits","localeMatcher","formatMatcher"];function e(t,e){"undefined"!=typeof console&&(console.warn("[vue-i18n] "+t),e&&console.warn(e.stack))}function n(t){return null!==t&&"object"==typeof t}const s=Object.prototype.toString,r="[object Object]";function i(t){return s.call(t)===r}function a(t){return null==t}function o(...t){let e=null,s=null;return 1===t.length?n(t[0])||Array.isArray(t[0])?s=t[0]:"string"==typeof t[0]&&(e=t[0]):2===t.length&&("string"==typeof t[0]&&(e=t[0]),(n(t[1])||Array.isArray(t[1]))&&(s=t[1])),{locale:e,params:s}}function l(t){return JSON.parse(JSON.stringify(t))}const c=Object.prototype.hasOwnProperty;function u(t,e){return c.call(t,e)}function h(t){const e=Object(t);for(let t=1;t<arguments.length;t++){const s=arguments[t];if(null!=s){let t;for(t in 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numberFormats(){return l(this._getNumberFormats())}get availableLocales(){return Object.keys(this.messages).sort()}get locale(){return this._vm.locale}set locale(t){this._vm.$set(this._vm,"locale",t)}get fallbackLocale(){return this._vm.fallbackLocale}set fallbackLocale(t){this._vm.$set(this._vm,"fallbackLocale",t)}get formatFallbackMessages(){return this._formatFallbackMessages}set formatFallbackMessages(t){this._formatFallbackMessages=t}get missing(){return this._missing}set missing(t){this._missing=t}get formatter(){return this._formatter}set formatter(t){this._formatter=t}get silentTranslationWarn(){return this._silentTranslationWarn}set silentTranslationWarn(t){this._silentTranslationWarn=t}get silentFallbackWarn(){return this._silentFallbackWarn}set silentFallbackWarn(t){this._silentFallbackWarn=t}get preserveDirectiveContent(){return this._preserveDirectiveContent}set preserveDirectiveContent(t){this._preserveDirectiveContent=t}get warnHtmlInMessage(){return this._warnHtmlInMessage}set warnHtmlInMessage(t){const e=this._warnHtmlInMessage;if(this._warnHtmlInMessage=t,e!==t&&("warn"===t||"error"===t)){const t=this._getMessages();Object.keys(t).forEach(e=>{this._checkLocaleMessage(e,this._warnHtmlInMessage,t[e])})}}_getMessages(){return this._vm.messages}_getDateTimeFormats(){return this._vm.dateTimeFormats}_getNumberFormats(){return this._vm.numberFormats}_warnDefault(t,e,n,s,r){if(!a(n))return n;if(this._missing){const n=this._missing.apply(null,[t,e,s,r]);if("string"==typeof n)return n}if(this._formatFallbackMessages){const t=o(...r);return this._render(e,"string",t.params,e)}return e}_isFallbackRoot(t){return!t&&!a(this._root)&&this._fallbackRoot}_isSilentFallbackWarn(t){return this._silentFallbackWarn instanceof RegExp?this._silentFallbackWarn.test(t):this._silentFallbackWarn}_isSilentFallback(t,e){return this._isSilentFallbackWarn(e)&&(this._isFallbackRoot()||t!==this.fallbackLocale)}_isSilentTranslationWarn(t){return this._silentTranslationWarn instanceof RegExp?this._silentTranslationWarn.test(t):this._silentTranslationWarn}_interpolate(t,e,n,s,r,o,l){if(!e)return null;const c=this._path.getPathValue(e,n);if(Array.isArray(c)||i(c))return c;let u;if(a(c)){if(!i(e))return null;if("string"!=typeof(u=e[n]))return null}else{if("string"!=typeof c)return null;u=c}return(u.indexOf("@:")>=0||u.indexOf("@.")>=0)&&(u=this._link(t,e,u,s,"raw",o,l)),this._render(u,r,o,n)}_link(t,e,n,s,r,i,a){let o=n;const l=o.match(U);for(const n in l){if(!l.hasOwnProperty(n))continue;const c=l[n],u=c.match(q),[h,f]=u,m=c.replace(h,"").replace(B,"");if(a.includes(m))return o;a.push(m);let _=this._interpolate(t,e,m,s,"raw"===r?"string":r,"raw"===r?void 0:i,a);if(this._isFallbackRoot(_)){if(!this._root)throw Error("unexpected error");const t=this._root.$i18n;_=t._translate(t._getMessages(),t.locale,t.fallbackLocale,m,s,r,i)}_=this._warnDefault(t,m,_,s,Array.isArray(i)?i:[i]),this._modifiers.hasOwnProperty(f)?_=this._modifiers[f](_):G.hasOwnProperty(f)&&(_=G[f](_)),a.pop(),o=_?o.replace(c,_):o}return o}_render(t,e,n,s){let r=this._formatter.interpolate(t,n,s);return r||(r=X.interpolate(t,n,s)),"string"===e?r.join(""):r}_translate(t,e,n,s,r,i,o){let l=this._interpolate(e,t[e],s,r,i,o,[s]);return a(l)&&a(l=this._interpolate(n,t[n],s,r,i,o,[s]))?null:l}_t(t,e,n,s,...r){if(!t)return"";const i=o(...r),a=i.locale||e,l=this._translate(n,a,this.fallbackLocale,t,s,"string",i.params);if(this._isFallbackRoot(l)){if(!this._root)throw Error("unexpected error");return this._root.$t(t,...r)}return this._warnDefault(a,t,l,s,r)}t(t,...e){return this._t(t,this.locale,this._getMessages(),null,...e)}_i(t,e,n,s,r){const i=this._translate(n,e,this.fallbackLocale,t,s,"raw",r);if(this._isFallbackRoot(i)){if(!this._root)throw Error("unexpected error");return this._root.$i18n.i(t,e,r)}return this._warnDefault(e,t,i,s,[r])}i(t,e,n){return t?("string"!=typeof e&&(e=this.locale),this._i(t,e,this._getMessages(),null,n)):""}_tc(t,e,n,s,r,...i){if(!t)return"";void 0===r&&(r=1);const a={count:r,n:r},l=o(...i);return l.params=Object.assign(a,l.params),i=null===l.locale?[l.params]:[l.locale,l.params],this.fetchChoice(this._t(t,e,n,s,...i),r)}fetchChoice(t,e){if(!t&&"string"!=typeof t)return null;const n=t.split("|");return n[e=this.getChoiceIndex(e,n.length)]?n[e].trim():t}getChoiceIndex(t,e){return this.locale in this.pluralizationRules?this.pluralizationRules[this.locale].apply(this,[t,e]):((t,e)=>(t=Math.abs(t),2===e?t?t>1?1:0:1:t?Math.min(t,2):0))(t,e)}tc(t,e,...n){return this._tc(t,this.locale,this._getMessages(),null,e,...n)}_te(t,e,n,...s){const r=o(...s).locale||e;return this._exist(n[r],t)}te(t,e){return this._te(t,this.locale,this._getMessages(),e)}getLocaleMessage(t){return l(this._vm.messages[t]||{})}setLocaleMessage(t,e){("warn"!==this._warnHtmlInMessage&&"error"!==this._warnHtmlInMessage||(this._checkLocaleMessage(t,this._warnHtmlInMessage,e),"error"!==this._warnHtmlInMessage))&&this._vm.$set(this._vm.messages,t,e)}mergeLocaleMessage(t,e){("warn"!==this._warnHtmlInMessage&&"error"!==this._warnHtmlInMessage||(this._checkLocaleMessage(t,this._warnHtmlInMessage,e),"error"!==this._warnHtmlInMessage))&&this._vm.$set(this._vm.messages,t,h(this._vm.messages[t]||{},e))}getDateTimeFormat(t){return l(this._vm.dateTimeFormats[t]||{})}setDateTimeFormat(t,e){this._vm.$set(this._vm.dateTimeFormats,t,e)}mergeDateTimeFormat(t,e){this._vm.$set(this._vm.dateTimeFormats,t,h(this._vm.dateTimeFormats[t]||{},e))}_localizeDateTime(t,e,n,s,r){let i=e,o=s[i];if((a(o)||a(o[r]))&&(o=s[i=n]),a(o)||a(o[r]))return null;{const e=o[r],n=`${i}__${r}`;let s=this._dateTimeFormatters[n];return s||(s=this._dateTimeFormatters[n]=new Intl.DateTimeFormat(i,e)),s.format(t)}}_d(t,e,n){if(!n)return new Intl.DateTimeFormat(e).format(t);const s=this._localizeDateTime(t,e,this.fallbackLocale,this._getDateTimeFormats(),n);if(this._isFallbackRoot(s)){if(!this._root)throw Error("unexpected error");return this._root.$i18n.d(t,n,e)}return s||""}d(t,...e){let s=this.locale,r=null;return 1===e.length?"string"==typeof e[0]?r=e[0]:n(e[0])&&(e[0].locale&&(s=e[0].locale),e[0].key&&(r=e[0].key)):2===e.length&&("string"==typeof e[0]&&(r=e[0]),"string"==typeof e[1]&&(s=e[1])),this._d(t,s,r)}getNumberFormat(t){return l(this._vm.numberFormats[t]||{})}setNumberFormat(t,e){this._vm.$set(this._vm.numberFormats,t,e)}mergeNumberFormat(t,e){this._vm.$set(this._vm.numberFormats,t,h(this._vm.numberFormats[t]||{},e))}_getNumberFormatter(t,e,n,s,r,i){let o=e,l=s[o];if((a(l)||a(l[r]))&&(l=s[o=n]),a(l)||a(l[r]))return null;{const t=l[r];let e;if(i)e=new Intl.NumberFormat(o,Object.assign({},t,i));else{const n=`${o}__${r}`;(e=this._numberFormatters[n])||(e=this._numberFormatters[n]=new Intl.NumberFormat(o,t))}return e}}_n(t,e,n,s){if(!Z.availabilities.numberFormat)return"";if(!n){return(s?new Intl.NumberFormat(e,s):new Intl.NumberFormat(e)).format(t)}const r=this._getNumberFormatter(t,e,this.fallbackLocale,this._getNumberFormats(),n,s),i=r&&r.format(t);if(this._isFallbackRoot(i)){if(!this._root)throw Error("unexpected error");return this._root.$i18n.n(t,Object.assign({},{key:n,locale:e},s))}return i||""}n(e,...s){let r=this.locale,i=null,a=null;return 1===s.length?"string"==typeof s[0]?i=s[0]:n(s[0])&&(s[0].locale&&(r=s[0].locale),s[0].key&&(i=s[0].key),a=Object.keys(s[0]).reduce((e,n)=>t.includes(n)?Object.assign({},e,{[n]:s[0][n]}):e,null)):2===s.length&&("string"==typeof s[0]&&(i=s[0]),"string"==typeof s[1]&&(r=s[1])),this._n(e,r,i,a)}_ntp(t,e,n,s){if(!Z.availabilities.numberFormat)return[];if(!n){return(s?new Intl.NumberFormat(e,s):new Intl.NumberFormat(e)).formatToParts(t)}const r=this._getNumberFormatter(t,e,this.fallbackLocale,this._getNumberFormats(),n,s),i=r&&r.formatToParts(t);if(this._isFallbackRoot(i)){if(!this._root)throw Error("unexpected error");return this._root.$i18n._ntp(t,e,n,s)}return i||[]}}let K;Object.defineProperty(Z,"availabilities",{get(){if(!K){const t="undefined"!=typeof Intl;K={dateTimeFormat:t&&void 0!==Intl.DateTimeFormat,numberFormat:t&&void 0!==Intl.NumberFormat}}return K}}),Z.install=D,Z.version="8.15.1";export default Z;
\ No newline at end of file
diff --git a/dist/vue-i18n.esm.js b/dist/vue-i18n.esm.js
index 12351aaea..19a12ff6c 100644
--- a/dist/vue-i18n.esm.js
+++ b/dist/vue-i18n.esm.js
@@ -20,7 +20,8 @@ var numberFormatKeys = [
   'minimumSignificantDigits',
   'maximumSignificantDigits',
   'localeMatcher',
-  'formatMatcher'
+  'formatMatcher',
+  'unit'
 ];
 
 /**
diff --git a/dist/vue-i18n.js b/dist/vue-i18n.js
index 9465df63e..323b4e02d 100644
--- a/dist/vue-i18n.js
+++ b/dist/vue-i18n.js
@@ -26,7 +26,8 @@
     'minimumSignificantDigits',
     'maximumSignificantDigits',
     'localeMatcher',
-    'formatMatcher'
+    'formatMatcher',
+    'unit'
   ];
 
   /**
diff --git a/dist/vue-i18n.min.js b/dist/vue-i18n.min.js
index f0bce2c60..478f4ccae 100644
--- a/dist/vue-i18n.min.js
+++ b/dist/vue-i18n.min.js
@@ -3,4 +3,4 @@
  * (c) 2019 kazuya kawaguchi
  * Released under the MIT License.
  */
-var t,e;t=this,e=function(){"use strict";var t=["style","currency","currencyDisplay","useGrouping","minimumIntegerDigits","minimumFractionDigits","maximumFractionDigits","minimumSignificantDigits","maximumSignificantDigits","localeMatcher","formatMatcher"];function e(t,e){"undefined"!=typeof console&&(console.warn("[vue-i18n] "+t),e&&console.warn(e.stack))}function n(t){return null!==t&&"object"==typeof t}var r=Object.prototype.toString,i="[object Object]";function a(t){return r.call(t)===i}function s(t){return null==t}function o(){for(var t=[],e=arguments.length;e--;)t[e]=arguments[e];var r=null,i=null;return 1===t.length?n(t[0])||Array.isArray(t[0])?i=t[0]:"string"==typeof t[0]&&(r=t[0]):2===t.length&&("string"==typeof t[0]&&(r=t[0]),(n(t[1])||Array.isArray(t[1]))&&(i=t[1])),{locale:r,params:i}}function l(t){return JSON.parse(JSON.stringify(t))}var c=Object.prototype.hasOwnProperty;function u(t,e){return c.call(t,e)}function f(t){for(var e=arguments,r=Object(t),i=1;i<arguments.length;i++){var a=e[i];if(null!=a){var s=void 0;for(s in a)u(a,s)&&(n(a[s])?r[s]=f(r[s],a[s]):r[s]=a[s])}}return r}function h(t,e){if(t===e)return!0;var r=n(t),i=n(e);if(!r||!i)return!r&&!i&&String(t)===String(e);try{var a=Array.isArray(t),s=Array.isArray(e);if(a&&s)return t.length===e.length&&t.every(function(t,n){return h(t,e[n])});if(a||s)return!1;var o=Object.keys(t),l=Object.keys(e);return o.length===l.length&&o.every(function(n){return h(t[n],e[n])})}catch(t){return!1}}var p={beforeCreate:function(){var t=this.$options;if(t.i18n=t.i18n||(t.__i18n?{}:null),t.i18n){if(t.i18n instanceof Q){if(t.__i18n)try{var e={};t.__i18n.forEach(function(t){e=f(e,JSON.parse(t))}),Object.keys(e).forEach(function(n){t.i18n.mergeLocaleMessage(n,e[n])})}catch(t){}this._i18n=t.i18n,this._i18nWatcher=this._i18n.watchI18nData()}else if(a(t.i18n)){if(this.$root&&this.$root.$i18n&&this.$root.$i18n instanceof Q&&(t.i18n.root=this.$root,t.i18n.formatter=this.$root.$i18n.formatter,t.i18n.fallbackLocale=this.$root.$i18n.fallbackLocale,t.i18n.formatFallbackMessages=this.$root.$i18n.formatFallbackMessages,t.i18n.silentTranslationWarn=this.$root.$i18n.silentTranslationWarn,t.i18n.silentFallbackWarn=this.$root.$i18n.silentFallbackWarn,t.i18n.pluralizationRules=this.$root.$i18n.pluralizationRules,t.i18n.preserveDirectiveContent=this.$root.$i18n.preserveDirectiveContent),t.__i18n)try{var n={};t.__i18n.forEach(function(t){n=f(n,JSON.parse(t))}),t.i18n.messages=n}catch(t){}var r=t.i18n.sharedMessages;r&&a(r)&&(t.i18n.messages=f(t.i18n.messages,r)),this._i18n=new Q(t.i18n),this._i18nWatcher=this._i18n.watchI18nData(),(void 0===t.i18n.sync||t.i18n.sync)&&(this._localeWatcher=this.$i18n.watchLocale())}}else this.$root&&this.$root.$i18n&&this.$root.$i18n instanceof Q?this._i18n=this.$root.$i18n:t.parent&&t.parent.$i18n&&t.parent.$i18n instanceof Q&&(this._i18n=t.parent.$i18n)},beforeMount:function(){var t=this.$options;t.i18n=t.i18n||(t.__i18n?{}:null),t.i18n?t.i18n instanceof Q?(this._i18n.subscribeDataChanging(this),this._subscribing=!0):a(t.i18n)&&(this._i18n.subscribeDataChanging(this),this._subscribing=!0):this.$root&&this.$root.$i18n&&this.$root.$i18n instanceof Q?(this._i18n.subscribeDataChanging(this),this._subscribing=!0):t.parent&&t.parent.$i18n&&t.parent.$i18n instanceof Q&&(this._i18n.subscribeDataChanging(this),this._subscribing=!0)},beforeDestroy:function(){if(this._i18n){var t=this;this.$nextTick(function(){t._subscribing&&(t._i18n.unsubscribeDataChanging(t),delete t._subscribing),t._i18nWatcher&&(t._i18nWatcher(),t._i18n.destroyVM(),delete t._i18nWatcher),t._localeWatcher&&(t._localeWatcher(),delete t._localeWatcher),t._i18n=null})}}},m={name:"i18n",functional:!0,props:{tag:{type:String},path:{type:String,required:!0},locale:{type:String},places:{type:[Array,Object]}},render:function(t,e){var n=e.data,r=e.parent,i=e.props,a=e.slots,s=r.$i18n;if(s){var o=i.path,l=i.locale,c=i.places,u=a(),f=s.i(o,l,function(t){var e;for(e in t)if("default"!==e)return!1;return Boolean(e)}(u)||c?function(t,e){var n=e?function(t){return Array.isArray(t)?t.reduce(_,{}):Object.assign({},t)}(e):{};if(!t)return n;var r=(t=t.filter(function(t){return t.tag||""!==t.text.trim()})).every(v);return t.reduce(r?g:_,n)}(u.default,c):u),h=i.tag||"span";return h?t(h,n,f):f}}};function g(t,e){return e.data&&e.data.attrs&&e.data.attrs.place&&(t[e.data.attrs.place]=e),t}function _(t,e,n){return t[n]=e,t}function v(t){return Boolean(t.data&&t.data.attrs&&t.data.attrs.place)}var y,b={name:"i18n-n",functional:!0,props:{tag:{type:String,default:"span"},value:{type:Number,required:!0},format:{type:[String,Object]},locale:{type:String}},render:function(e,r){var i=r.props,a=r.parent,s=r.data,o=a.$i18n;if(!o)return null;var l=null,c=null;"string"==typeof i.format?l=i.format:n(i.format)&&(i.format.key&&(l=i.format.key),c=Object.keys(i.format).reduce(function(e,n){var r;return t.includes(n)?Object.assign({},e,((r={})[n]=i.format[n],r)):e},null));var u=i.locale||o.locale,f=o._ntp(i.value,u,l,c),h=f.map(function(t,e){var n,r=s.scopedSlots&&s.scopedSlots[t.type];return r?r(((n={})[t.type]=t.value,n.index=e,n.parts=f,n)):t.value});return e(i.tag,{attrs:s.attrs,class:s.class,staticClass:s.staticClass},h)}};function d(t,e,n){w(t,n)&&$(t,e,n)}function F(t,e,n,r){if(w(t,n)){var i=n.context.$i18n;(function(t,e){var n=e.context;return t._locale===n.$i18n.locale})(t,n)&&h(e.value,e.oldValue)&&h(t._localeMessage,i.getLocaleMessage(i.locale))||$(t,e,n)}}function k(t,n,r,i){if(r.context){var a=r.context.$i18n||{};n.modifiers.preserve||a.preserveDirectiveContent||(t.textContent=""),t._vt=void 0,delete t._vt,t._locale=void 0,delete t._locale,t._localeMessage=void 0,delete t._localeMessage}else e("Vue instance does not exists in VNode context")}function w(t,n){var r=n.context;return r?!!r.$i18n||(e("VueI18n instance does not exists in Vue instance"),!1):(e("Vue instance does not exists in VNode context"),!1)}function $(t,n,r){var i,s,o=function(t){var e,n,r,i;"string"==typeof t?e=t:a(t)&&(e=t.path,n=t.locale,r=t.args,i=t.choice);return{path:e,locale:n,args:r,choice:i}}(n.value),l=o.path,c=o.locale,u=o.args,f=o.choice;if(l||c||u)if(l){var h=r.context;t._vt=t.textContent=f?(i=h.$i18n).tc.apply(i,[l,f].concat(M(c,u))):(s=h.$i18n).t.apply(s,[l].concat(M(c,u))),t._locale=h.$i18n.locale,t._localeMessage=h.$i18n.getLocaleMessage(h.$i18n.locale)}else e("`path` is required in v-t directive");else e("value type not supported")}function M(t,e){var n=[];return t&&n.push(t),e&&(Array.isArray(e)||a(e))&&n.push(e),n}function D(t){D.installed=!0;(y=t).version&&Number(y.version.split(".")[0]);!function(t){t.prototype.hasOwnProperty("$i18n")||Object.defineProperty(t.prototype,"$i18n",{get:function(){return this._i18n}}),t.prototype.$t=function(t){for(var e=[],n=arguments.length-1;n-- >0;)e[n]=arguments[n+1];var r=this.$i18n;return r._t.apply(r,[t,r.locale,r._getMessages(),this].concat(e))},t.prototype.$tc=function(t,e){for(var n=[],r=arguments.length-2;r-- >0;)n[r]=arguments[r+2];var i=this.$i18n;return i._tc.apply(i,[t,i.locale,i._getMessages(),this,e].concat(n))},t.prototype.$te=function(t,e){var n=this.$i18n;return n._te(t,n.locale,n._getMessages(),e)},t.prototype.$d=function(t){for(var e,n=[],r=arguments.length-1;r-- >0;)n[r]=arguments[r+1];return(e=this.$i18n).d.apply(e,[t].concat(n))},t.prototype.$n=function(t){for(var e,n=[],r=arguments.length-1;r-- >0;)n[r]=arguments[r+1];return(e=this.$i18n).n.apply(e,[t].concat(n))}}(y),y.mixin(p),y.directive("t",{bind:d,update:F,unbind:k}),y.component(m.name,m),y.component(b.name,b),y.config.optionMergeStrategies.i18n=function(t,e){return void 0===e?t:e}}var T=function(){this._caches=Object.create(null)};T.prototype.interpolate=function(t,e){if(!e)return[t];var r=this._caches[t];return r||(r=function(t){var e=[],n=0,r="";for(;n<t.length;){var 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this._root.$i18n.i(t,e,i)}return this._warnDefault(e,t,a,r,[i])},Q.prototype.i=function(t,e,n){return t?("string"!=typeof e&&(e=this.locale),this._i(t,e,this._getMessages(),null,n)):""},Q.prototype._tc=function(t,e,n,r,i){for(var a,s=[],l=arguments.length-5;l-- >0;)s[l]=arguments[l+5];if(!t)return"";void 0===i&&(i=1);var c={count:i,n:i},u=o.apply(void 0,s);return u.params=Object.assign(c,u.params),s=null===u.locale?[u.params]:[u.locale,u.params],this.fetchChoice((a=this)._t.apply(a,[t,e,n,r].concat(s)),i)},Q.prototype.fetchChoice=function(t,e){if(!t&&"string"!=typeof t)return null;var n=t.split("|");return n[e=this.getChoiceIndex(e,n.length)]?n[e].trim():t},Q.prototype.getChoiceIndex=function(t,e){var n,r;return this.locale in this.pluralizationRules?this.pluralizationRules[this.locale].apply(this,[t,e]):(n=t,r=e,n=Math.abs(n),2===r?n?n>1?1:0:1:n?Math.min(n,2):0)},Q.prototype.tc=function(t,e){for(var n,r=[],i=arguments.length-2;i-- >0;)r[i]=arguments[i+2];return(n=this)._tc.apply(n,[t,this.locale,this._getMessages(),null,e].concat(r))},Q.prototype._te=function(t,e,n){for(var r=[],i=arguments.length-3;i-- >0;)r[i]=arguments[i+3];var a=o.apply(void 0,r).locale||e;return this._exist(n[a],t)},Q.prototype.te=function(t,e){return this._te(t,this.locale,this._getMessages(),e)},Q.prototype.getLocaleMessage=function(t){return l(this._vm.messages[t]||{})},Q.prototype.setLocaleMessage=function(t,e){("warn"!==this._warnHtmlInMessage&&"error"!==this._warnHtmlInMessage||(this._checkLocaleMessage(t,this._warnHtmlInMessage,e),"error"!==this._warnHtmlInMessage))&&this._vm.$set(this._vm.messages,t,e)},Q.prototype.mergeLocaleMessage=function(t,e){("warn"!==this._warnHtmlInMessage&&"error"!==this._warnHtmlInMessage||(this._checkLocaleMessage(t,this._warnHtmlInMessage,e),"error"!==this._warnHtmlInMessage))&&this._vm.$set(this._vm.messages,t,f(this._vm.messages[t]||{},e))},Q.prototype.getDateTimeFormat=function(t){return l(this._vm.dateTimeFormats[t]||{})},Q.prototype.setDateTimeFormat=function(t,e){this._vm.$set(this._vm.dateTimeFormats,t,e)},Q.prototype.mergeDateTimeFormat=function(t,e){this._vm.$set(this._vm.dateTimeFormats,t,f(this._vm.dateTimeFormats[t]||{},e))},Q.prototype._localizeDateTime=function(t,e,n,r,i){var a=e,o=r[a];if((s(o)||s(o[i]))&&(o=r[a=n]),s(o)||s(o[i]))return null;var l=o[i],c=a+"__"+i,u=this._dateTimeFormatters[c];return u||(u=this._dateTimeFormatters[c]=new Intl.DateTimeFormat(a,l)),u.format(t)},Q.prototype._d=function(t,e,n){if(!n)return new Intl.DateTimeFormat(e).format(t);var r=this._localizeDateTime(t,e,this.fallbackLocale,this._getDateTimeFormats(),n);if(this._isFallbackRoot(r)){if(!this._root)throw Error("unexpected error");return this._root.$i18n.d(t,n,e)}return r||""},Q.prototype.d=function(t){for(var e=[],r=arguments.length-1;r-- >0;)e[r]=arguments[r+1];var i=this.locale,a=null;return 1===e.length?"string"==typeof e[0]?a=e[0]:n(e[0])&&(e[0].locale&&(i=e[0].locale),e[0].key&&(a=e[0].key)):2===e.length&&("string"==typeof e[0]&&(a=e[0]),"string"==typeof e[1]&&(i=e[1])),this._d(t,i,a)},Q.prototype.getNumberFormat=function(t){return l(this._vm.numberFormats[t]||{})},Q.prototype.setNumberFormat=function(t,e){this._vm.$set(this._vm.numberFormats,t,e)},Q.prototype.mergeNumberFormat=function(t,e){this._vm.$set(this._vm.numberFormats,t,f(this._vm.numberFormats[t]||{},e))},Q.prototype._getNumberFormatter=function(t,e,n,r,i,a){var o=e,l=r[o];if((s(l)||s(l[i]))&&(l=r[o=n]),s(l)||s(l[i]))return null;var c,u=l[i];if(a)c=new Intl.NumberFormat(o,Object.assign({},u,a));else{var f=o+"__"+i;(c=this._numberFormatters[f])||(c=this._numberFormatters[f]=new Intl.NumberFormat(o,u))}return c},Q.prototype._n=function(t,e,n,r){if(!Q.availabilities.numberFormat)return"";if(!n)return(r?new Intl.NumberFormat(e,r):new Intl.NumberFormat(e)).format(t);var i=this._getNumberFormatter(t,e,this.fallbackLocale,this._getNumberFormats(),n,r),a=i&&i.format(t);if(this._isFallbackRoot(a)){if(!this._root)throw Error("unexpected error");return this._root.$i18n.n(t,Object.assign({},{key:n,locale:e},r))}return a||""},Q.prototype.n=function(e){for(var r=[],i=arguments.length-1;i-- >0;)r[i]=arguments[i+1];var a=this.locale,s=null,o=null;return 1===r.length?"string"==typeof r[0]?s=r[0]:n(r[0])&&(r[0].locale&&(a=r[0].locale),r[0].key&&(s=r[0].key),o=Object.keys(r[0]).reduce(function(e,n){var i;return t.includes(n)?Object.assign({},e,((i={})[n]=r[0][n],i)):e},null)):2===r.length&&("string"==typeof r[0]&&(s=r[0]),"string"==typeof r[1]&&(a=r[1])),this._n(e,a,s,o)},Q.prototype._ntp=function(t,e,n,r){if(!Q.availabilities.numberFormat)return[];if(!n)return(r?new Intl.NumberFormat(e,r):new Intl.NumberFormat(e)).formatToParts(t);var i=this._getNumberFormatter(t,e,this.fallbackLocale,this._getNumberFormats(),n,r),a=i&&i.formatToParts(t);if(this._isFallbackRoot(a)){if(!this._root)throw Error("unexpected error");return this._root.$i18n._ntp(t,e,n,r)}return a||[]},Object.defineProperties(Q.prototype,Y),Object.defineProperty(Q,"availabilities",{get:function(){if(!U){var t="undefined"!=typeof Intl;U={dateTimeFormat:t&&void 0!==Intl.DateTimeFormat,numberFormat:t&&void 0!==Intl.NumberFormat}}return U}}),Q.install=D,Q.version="8.15.1",Q},"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):t.VueI18n=e();
\ No newline at end of file
diff --git a/src/util.js b/src/util.js
index 834af4ce6..04c021edd 100644
--- a/src/util.js
+++ b/src/util.js
@@ -15,7 +15,8 @@ export const numberFormatKeys = [
   'minimumSignificantDigits',
   'maximumSignificantDigits',
   'localeMatcher',
-  'formatMatcher'
+  'formatMatcher',
+  'unit'
 ]
 
 /**