Our style guide suggests that optional parameters should usually be
keyword-only arguments (see PEP 3102) to prevent confusion based
on positional arguments - for example,
"hypothesis.strategies.floats()" takes up to four boolean flags and
many of the Numpy strategies have both "dims" and "side" bounds.
This release converts most optional parameters in our API to use
keyword-only arguments - and adds a compatibility shim so you get
warnings rather than errors everywhere (issue #2130).
The canonical version of these notes (with links) is on readthedocs.