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/iconv constants in stubs (#8714)

Generate optimizer func info from stubs for various extensions (#7409)

ext/hash, ext/iconv, ext/mbstring, ext/xml, ext/zlib

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 iconv parameter names

And rename charset to encoding, including inside error messages.

Closes GH-6234.

Fix UNKNOWN default values in various extensions

Closes GH-5514

Generate functions entries from stubs for another set of extensions

Closes GH-5351

iconv_strlen() cannot return a string

Add union return types for function stubs

Accept null lengths for substr functions()

If a null $length is passed to any of these functions, behave as if no
parameter was passed:

- substr()
- substr_count()
-

Accept null lengths for substr functions()

If a null $length is passed to any of these functions, behave as if no
parameter was passed:

- substr()
- substr_count()
- substr_compare()
- iconv_substr()

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Add ext/iconv stubs