Generating non-IEEE `floats` - such as `bfloat16`, `bfloat32`, or various `float8_*` types

[qthequartermasterman]

Thank you for hypothesis! It's a wonderful library that I use frequently.

While investigating a bug report from one of the users of my extension library: https://github.com/qthequartermasterman/hypothesis-torch/issues/20, I realized that there is no obvious way (at least to me) in hypothesis to build a strategy that can generate only floats of width other than 16, 32, or 64, such as bfloat16 or bfloat32.

Is there a straightforward way to construct such a strategy?

There is a mention of a desire to support these types after the float overhaul, but I cannot find any other references to such work ever being done.

I looked into the internals of how floats handles width currently, and it looks like floats_of could be extended using a similar technique of stuct packing/unpacking. Before I implement that however, I was hoping to see if there is a more straightforward way.

Is there a straightforward way to generate only bfloat16-valid floats using hypothesis?