`FuncScale`

added for arbitrary axes scalesΒΆA new `FuncScale`

class was added (and `FuncTransform`

)
to allow the user to have arbitrary scale transformations without having to
write a new subclass of `ScaleBase`

. This can be accessed by
`ax.set_yscale('function', functions=(forward, inverse))`

, where
`forward`

and `inverse`

are callables that return the scale transform and
its inverse. See the last example in Scales.