3.15.0 - 2021.06.21

• Added RegExp named capture groups polyfill, #521, #944
• Added RegExp dotAll flag polyfill, #792, #944
• Added missed polyfills of Annex B features (required mainly for some non-browser engines), #336, #945:
  • escape
  • unescape
  • String.prototype.substr
  • Date.prototype.getYear
  • Date.prototype.setYear
  • Date.prototype.toGMTString
• Fixed detection of forbidden host code points in URL polyfill
• Allowed rhino target in core-js-compat / core-js-builder, added compat data for rhino 1.7.13, #942, thanks @gausie
• .at marked as supported from FF90