Fix type error on XSLTProcessor::transformToDoc return value with SimpleXML

The return type is wrong. You can also use this method with SimpleXML.
In fact, PHP provides a way that even t

Fix type error on XSLTProcessor::transformToDoc return value with SimpleXML

The return type is wrong. You can also use this method with SimpleXML.
In fact, PHP provides a way that even third party libraries can hook
into its XML handling. Therefore, we cannot even use the
SimpleXML|DOMDocument|false union type as third party extensions may
extend the possibilities.

Broke in 8.1 in 1b35056a33.

Closes GH-12315.

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Declare tentative return types for ext/xsl

Relates to GH-6995

Generate class entries from stubs for com, standard, xmlreader, xmlwriter, xsl, zip, Zend

Closes GH-6706

Update ext/xsl parameter names

Additionally normalize to using $namespace rather than $uri for
namespace parameters, including in XMLReader and XMLWriter. I went
with that one as it

Update ext/xsl parameter names

Additionally normalize to using $namespace rather than $uri for
namespace parameters, including in XMLReader and XMLWriter. I went
with that one as it is currently used by DOM, SimpleXML and XSL --
and our DOM parameter names follow the DOM specification.

Closes GH-6295.

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Move custom type checks to ZPP

Closes GH-6034

Fix UNKNOWN default values in ext/xsl

Generate method entries for ext/xsl

Closes GH-5372