Fixed hex char parsing

Fixed incorrect logical conditions

Consolidate new union type ZPP macro names

They will now follow the canonical order of types. Older macros are
left intact due to maintaining BC.

Closes GH-6112

Added FFI\CType::getName() method

Add more precise type info for stubs

Closes GH-6005

Add all the missing parameter types to stubs

Closes GH-5955

Implement named parameters

From an engine perspective, named parameters mainly add three
concepts:

* The SEND_* opcodes now accept a CONST op2, which is the
argument nam

Implement named parameters

From an engine perspective, named parameters mainly add three
concepts:

* The SEND_* opcodes now accept a CONST op2, which is the
argument name. For now, it is looked up by linear scan and
runtime cached.
* This may leave UNDEF arguments on the stack. To avoid having
to deal with them in other places, a CHECK_UNDEF_ARGS opcode
is used to either replace them with defaults, or error.
* For variadic functions, EX(extra_named_params) are collected
and need to be freed based on ZEND_CALL_HAS_EXTRA_NAMED_PARAMS.

RFC: https://wiki.php.net/rfc/named_params

Closes GH-5357.

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(ffi) fix ifdefs for non-windows systems without long double

Closes GH-5840

Review the usage of apostrophes in error messages

Closes GH-5590

Remove no_separation flag

Remove proto comments from C files

Closes GH-5758

Add get_gc handle for object iterators

Optional handler with the same semantics as the object handler.

Fix #79749: Converting FFI instances to bool fails

Casting objects to bool is supposed to yield `true`. Since the
`cast_object` handler is required now, we have to implement the
`_I

Fix #79749: Converting FFI instances to bool fails

Casting objects to bool is supposed to yield `true`. Since the
`cast_object` handler is required now, we have to implement the
`_IS_BOOL` conversion there.

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Use ZEND_UNREACHABLE() instead of ZEND_ASSERT(0)

Instead of marking unreachable code with `ZEND_ASSERT(0)`, we introduce
`ZEND_UNREACHABLE()`, so that MSVC which does not consider `asser

Use ZEND_UNREACHABLE() instead of ZEND_ASSERT(0)

Instead of marking unreachable code with `ZEND_ASSERT(0)`, we introduce
`ZEND_UNREACHABLE()`, so that MSVC which does not consider `assert(0)`
to mark unreachable code does no longer trigger C4715[1] warnings in
debug builds. This may be useful for other compilers as well.

[1] <https://docs.microsoft.com/de-de/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4715?view=vs-2019>

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Change GC_COLLECTABLE flag into GC_NOT_COLLECTABLE to simplify GC_MAY_LEAK() check

Fix some UNKNOWN default values

In ext/ffi, ext/intl, ext/mysqli, and ext/pcntl

Add helper APIs for maybe-interned string creation

Add ZVAL_CHAR/RETVAL_CHAR/RETURN_CHAR as a shortcut for using
ZVAL_INTERNED_STRING and ZSTR_CHAR.

Add zend_string_init_fast()

Add helper APIs for maybe-interned string creation

Add ZVAL_CHAR/RETVAL_CHAR/RETURN_CHAR as a shortcut for using
ZVAL_INTERNED_STRING and ZSTR_CHAR.

Add zend_string_init_fast() as a helper for the empty string /
one char interned string / zend_string_init() pattern.

Also add corresponding ZVAL_STRINGL_FAST etc macros.

Closes GH-5684.

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Fix expression warnings and break warnings

Close GH-5675.

Use zend_zval_type_name() API where possible

Rather than zend_get_type_by_const(Z_TYPE_P()).

Fix #79571: FFI: var_dumping unions may segfault

We must not attempt to access arbitrary union members when retrieving
debug info, because that may not be valid. Therefore we do no long

Fix #79571: FFI: var_dumping unions may segfault

We must not attempt to access arbitrary union members when retrieving
debug info, because that may not be valid. Therefore we do no longer
dereference pointer types inside of unions, but report their address as
string in `%p` format instead.

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Fix UNKNOWN default values in various extensions

Closes GH-5514

Clarify that FFI::cdef() does not return NULL

Improve a last couple of argument error messages

Closes GH-5404

Add zend_string_concat2 API

Generate method entries from stubs for curl, ffi, pdo, phar

Closes GH-5375