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Git'Fellow 4920bd1725 refactor: add PHP 8.3 types to BC-safe class constants
PHP 8.3 allows class constants to declare a type. Adopt it where doing so
cannot break third-party apps.

Typing an inheritable constant is a hard BC break: a subclass that
redeclares it untyped fails to load with "Type of C::FOO must be
compatible with P::FOO of type string". Changes are therefore limited to
constants that cannot be redeclared by a subclass:

  - private const (not inherited)
  - final public/protected const
  - constants declared in a final class or an enum

Interface constants, trait constants, and public/protected constants in
non-final (including abstract) classes are left untyped, as is all of
lib/public (OCP) and lib/unstable (NCU).

One review-requested exception: the public OBJECT_PREFIX/OBJECT_SUFFIX
constants of the app-internal CalDAV import helpers (TextImporter,
XmlImporter) are typed as well; these classes are not public API and
have no subclasses.

Only string, int and array are used. float is avoided because it would
silently coerce an int literal and change === comparisons. No constant
name or value is modified: every changed line adds only the type token,
so runtime behaviour is unchanged.

Signed-off-by: Git'Fellow <12234510+solracsf@users.noreply.github.com>
2026-08-11 13:52:52 +01:00
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