Sync date_diff and DateTime::diff return type

This function/method cannot return false.

Fix return type of DateTimeImmutable::__set_state()

DateTime*::getOffset() no longer returns false as of PHP 8.0.0

Cf. <https://github.com/php/doc-en/pull/282>.

Closes GH-6539.

Revert "DateTime:: and DateTimeImmutable::getTimestamp() may return false"

This reverts commit b67c23218950eae0a153b093dcefbe14b3b40901.

DateTime:: and DateTimeImmutable::getTimestamp() may return false

Fix ext/date stubs

Closes GH-6523.

Require stubs to declare return types for magic methods when possible

Closes GH-6376

Verify parameter names of function aliases

Closes GH-6335

Improve parameter names in ext/intl

Closes GH-6309

Add some ValueErrors to ext/date

Closes GH-5613

Add another round of missing parameter types to stubs

Closes GH-5950

Last pass of 'More consistent parameter names for date/time functions'

Another pass of improving ext/date argument names

More consistent parameter names for date/time functions

Add missing param to DatePeriod::__construct()

The signature is very overloaded, but takes at most four params,
not three.

Update outdated arginfo hashes

Introduce InternalIterator

Userland classes that implement Traversable must do so either
through Iterator or IteratorAggregate. The same requirement does
not exist for internal class

Introduce InternalIterator

Userland classes that implement Traversable must do so either
through Iterator or IteratorAggregate. The same requirement does
not exist for internal classes: They can implement the internal
get_iterator mechanism, without exposing either the Iterator or
IteratorAggregate APIs. This makes them usable in get_iterator(),
but incompatible with any Iterator based APIs.

A lot of internal classes do this, because exposing the userland
APIs is simply a lot of work. This patch alleviates this issue by
providing a generic InternalIterator class, which acts as an
adapater between get_iterator and Iterator, and can be easily
used by many internal classes. At the same time, we extend the
requirement that Traversable implies Iterator or IteratorAggregate
to internal classes as well.

Closes GH-5216.

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Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necess

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necessary.

This ensures that release artifacts will never try to regenerate
stubs and thus fetch PHP-Parser, as long as you do not modify any
files.

Closes GH-5739.

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Convert UNKNOWN default values to null in ext/date

Closes GH-5509

Generate method entries from stubs for a couple of extensions

Closes GH-5368

Add support for generating method entries from stubs

Closes GH-5363

Store default parameter values of internal functions in arg info

Closes GH-5353. From now on, PHP will have reflection information
about default values of parameters of internal function

Store default parameter values of internal functions in arg info

Closes GH-5353. From now on, PHP will have reflection information
about default values of parameters of internal functions.

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

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Generate function entries from stubs for a couple of extensions

Closes GH-5347

Adding DateTime(Immutable)::createFromInterface()

These are like

DateTime::createFromImmutable()
DateTimeImmutable::createFromMutable()

but accept any DateTimeI

Adding DateTime(Immutable)::createFromInterface()

These are like

DateTime::createFromImmutable()
DateTimeImmutable::createFromMutable()

but accept any DateTimeInterface instead.

Closes GH-5016.

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Support single class unions in gen stubs