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Date: Wed, 03 Dec 2025 22:23:28 +0000
To: internals@lists.php.net
Subject: Re: [PHP-DEV] [RFC] Type Aliases
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From: imsop.php@rwec.co.uk ("Rowan Tommins [IMSoP]")

On 3 December 2025 22:01:10 GMT, Rob Landers <rob@bottled=2Ecodes> wrote:
>On Wed, Dec 3, 2025, at 22:56, Morgan wrote:
>> Well, provided you stick to ASCII-only identifiers=2E=2E=2E
>>=20
>> ```
>>=20
>> class Th=C3=AFng {}
>>=20
>> class TH=C3=8FNG {}
>>=20
>> class th=C3=AFng {}
>> ```
>
>Classes are not case-sensitive: https://3v4l=2Eorg/PLb4J#v8=2E5=2E0


Morgan is right that the case folding is only applied to ASCII letters=2E =
In the example, "Th=C3=AFng" and "th=C3=AFng" are the same, because they di=
ffer only by "T" vs "t", but "TH=C3=8FNG" is different, because "=C3=AF" an=
d "=C3=8F" are not case folded=2E <https://3v4l=2Eorg/PLb4J#v8=2E5=2E0>

In fact, they're not treated as letters at all=2E If I remember correctly,=
 they're not even analysed as code points, each individual byte above 0x7F =
is treated as completely opaque=2E


Rowan Tommins
[IMSoP]