Fix return value in stub file for DOMNodeList::item

Not explicitly documenting the possibility of returning DOMElement causes
the Intelephense linter (a popular PHP linter with ~9 millio

Fix return value in stub file for DOMNodeList::item

Not explicitly documenting the possibility of returning DOMElement causes
the Intelephense linter (a popular PHP linter with ~9 million downloads:
https://marketplace.visualstudio.com/items?itemName=bmewburn.vscode-intelephense-client)
to think this code is bad:

$xp->query("whatever")->item(0)->getAttribute("foo");

DOMNode does not have getAttribute (while DOMElement does).
Documenting the DOMElement return type should fix Intelephense's linter.

Closes GH-11342.

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Rename @cname to @cvalue in stubs (#9043)

@cname currently refers to the constant name in C. However, it is not always a (constant) name, but sometimes a function invocation, so naming it as

Rename @cname to @cvalue in stubs (#9043)

@cname currently refers to the constant name in C. However, it is not always a (constant) name, but sometimes a function invocation, so naming it as @cvalue would be more appropriate.

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Declare ext/dom constants in stubs (#8676)

Add some stub related todo comments

Fix a few more classsynopsis generation issues

Closes GH-7480

Make a few unuseful DOMEntity properties readonly (#7406)

DOMCharacterData::$data and DOMAttr::$value are writable

Mark DOM classes as not serializable

Fix another DOMNameSpaceNode casing issue

Fix DOMNameSpaceNode casing

dom_import_simplexml() cannot return null

Fix return type of DOMNodeList::item()

It can also return DOMNameSpaceNode :(

Declare tentative return types for ext/dom (#6985)

Throw DomException for DOM out-of-memory error conditions

A number of error conditions in DOM can only occur if libxml2 runs
out of memory, at least as far as I can see. In such cases we

Throw DomException for DOM out-of-memory error conditions

A number of error conditions in DOM can only occur if libxml2 runs
out of memory, at least as far as I can see. In such cases we
currently do a silent "return false", which violates the DOM spec,
and which code is very unlikely to handle sensibly.

Switch these to throw a DomException with INVALID_STATE_ERR type.
This error type is chosen because we use for similar checks
elsewhere, for example:
https://github.com/php/php-src/blob/a733b1ada7895f6fa5e349755a878cae9189e3f5/ext/dom/documentfragment.c#L45-L48

This changes some of the more obvious cases I spotted, but there are probably more.

Closes GH-7049.

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Actually add the tentative type marker...

Add minimial tentative types to dom

Just for implementations of Countable. These (no longer) suffer
from an overly broad return type.

DOMNamedNodeMap::count() cannot return false

DOMNodeList::count() cannot return false

Refactor the implementation to make this obvious, and make use
of early returns.

Declare typed properties in ext/dom

Closes GH-7013

Declare dynamic properties in ext/dom

Closes GH-6644

Add missing classes to stubs

Implicitly enable function entry generation when class entry generation is enabled

Closes GH-6675

Make createDocument() $namespace nullable

According to the DOM specification, this argument should be
nullable. It's also supposed to be a required argument, but
not changing that at

Make createDocument() $namespace nullable

According to the DOM specification, this argument should be
nullable. It's also supposed to be a required argument, but
not changing that at this point.

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Make getElementsByTagNameNS $namespace nullable

According to the DOM specification, this argument is supposed to
be nullable.

Generate class entries for a few extensions

Relates to GH-6644