ctype_*() functions can operate with integer ranges -128~256 too

These are extremely fucky interfaces, but PHP is a shitty language anyway.

We need to support an input of `string|int` when validating for the
`ctype_*()` of an input, but at least we can assert for the value to
not be `empty()` when it passes such validation.

Ref: vimeo/psalm#2452

src/Assert.php

@@ -1060,6 +1060,7 @@ public static function startsWith($value, $prefix, $message = '')
 
     /**
      * @psalm-assert string $value
+     * @psalm-assert !empty $value
      *
      * @param mixed  $value
      * @param string $message
@@ -1163,6 +1164,7 @@ public static function unicodeLetters($value, $message = '')
 
     /**
      * @psalm-assert string $value
+     * @psalm-assert !empty $value
      *
      * @param mixed  $value
      * @param string $message
@@ -1189,8 +1191,8 @@ public static function alpha($value, $message = '')
     /**
      * @psalm-assert !empty $value
      *
-     * @param string $value
-     * @param string $message
+     * @param string|int $value   can be an integer, since ctype_* functions accept ASCII integers -128 ~ +256
+     * @param string     $message
      *
      * @throws InvalidArgumentException
      */
@@ -1212,8 +1214,8 @@ public static function digits($value, $message = '')
     /**
      * @psalm-assert !empty $value
      *
-     * @param string $value
-     * @param string $message
+     * @param string|int $value   can be an integer, since ctype_* functions accept ASCII integers -128 ~ +256
+     * @param string     $message
      *
      * @throws InvalidArgumentException
      */
@@ -1235,8 +1237,8 @@ public static function alnum($value, $message = '')
     /**
      * @psalm-assert !empty $value
      *
-     * @param string $value
-     * @param string $message
+     * @param string|int $value   can be an integer, since ctype_* functions accept ASCII integers -128 ~ +256
+     * @param string     $message
      *
      * @throws InvalidArgumentException
      */
@@ -1258,8 +1260,8 @@ public static function lower($value, $message = '')
     /**
      * @psalm-assert !empty $value
      *
-     * @param string $value
-     * @param string $message
+     * @param string|int $value   can be an integer, since ctype_* functions accept ASCII integers -128 ~ +256
+     * @param string     $message
      *
      * @throws InvalidArgumentException
      */