Implement __serialize() and __unserialize() on GMP

GMP directly implements internal serialize/unserialize handlers
rather than going through the Serializable interface, so it ended
u

Implement __serialize() and __unserialize() on GMP

GMP directly implements internal serialize/unserialize handlers
rather than going through the Serializable interface, so it ended
up being missed when adding the new __serialize()/__unserialize()
methods to other classes.

The serialization format is similar to before, but uses hex instead
of decimal encoding and omits the members if not used (which should
be almost always).

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Add more specific array return type hints for various extensions - part 2

ext/ftp, ext/gmp, ext/intl

Closes GH-7433

Implicitly enable function entry generation when class entry generation is enabled

Closes GH-6675

Generate class entries from stubs for another batch of extensions

Closes GH-6669

Update gmp+bcmath parameter names

Closes GH-6205.

Accept GMP|string|int union in GMP functions

This changes GMP functions to accept a GMP|string|int union with
standard semantics (and thus also uses it in function signatures).

Accept GMP|string|int union in GMP functions

This changes GMP functions to accept a GMP|string|int union with
standard semantics (and thus also uses it in function signatures).

Relative to the previous behavior, this means that GMP functions
in weak mode now also accept float and null, and in strict mode no
longer accept bool, and have full type information.

Closes GH-6139.

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Promote various warnings to Error in GMP extension

This gets rid of most false returns

Closes GH-5882

Add a few missing parameter types in stubs

Related to GH-5627

Promote warning related to operator overloading in ext/gmp to an exception

Generate functions entries from stubs for another set of extensions

Closes GH-5351

Annotate function aliases in stubs

Revert "Replace @param annotations with type declarations"

This reverts commit c31029f335ca1b453af799805c43c37e959ad555.

Replace @param annotations with type declarations

Add union return types with one class

Add union return types for function stubs

Fix required number of arguments in stubs

* get_parent_class() argument is optional
* Mark array_filter() $callback as optional
* The $base of gmp_strval() is optional
* DateTime

Fix required number of arguments in stubs

* get_parent_class() argument is optional
* Mark array_filter() $callback as optional
* The $base of gmp_strval() is optional
* DateTime constructor also accepts zero arguments
* hash_update_file() stream context is optional
* xmlwriter_write_dtd_entity() $isparam argument is optional

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Fix typo in type

Add ext/gmp stubs