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In porting Nyholm/psr7, some issues came up:

can't extend an interface and overwrite a method with a method taking an extended interface type:

interface x{
	public function bob();
}
interface y extends x{
	public function bill();
}


interface bob{
	public function process(x $bob);
}
interface sue extends bob{
	public function process(y $bob);
}

But I can extend with different return values

interface x{
	public function bob();
}
interface y extends x{
	public function bill();
}


interface bob{
	public function process(x $bob): x;
}
interface sue extends bob{
	public function process(x $bob): y;
}

same case with implement. As such, original Psr interfaces are used where necessary.
since PHP does not offer the ability to have a static and non-static method of the same name, Stream::create, which interferes with the new interface, has become Stream::defaultCreate. Here, the concept is, the static version of create will use a default configuration for stream creation.
tests written for Response to accept status string, but status typed as int in __construct. Remove int type declaration.
error occurs in phpunit tests on tests/UploadedFileTest.php cleanup when \file_exists encounters non-string. Conformed input to string.

psg / psr-100-implementation

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