Conflicts:
	CHANGES.rst
	Cython/Shadow.py

guess longness suffix of negative decimal integer literals based on their type to prevent the C compiler from truncating their value range

use explicit helper method for sequence->ctuple coercion rather than calling generic SequenceNode.coerce_to()

Fix typo in sharing_declarations

Though this path is never taken for unsigned ints, MSVC still throws
warning C4146.