Consider adding more properties to DataType

[iksnagreb]

It would be convenient to augment the DataType enum to represent more properties of the data type (besides the bitwidth, name, and NumPy equivalent), such as signedness, whether it is an integer or float (the latter is already implemented), or the minimum/maximum supported value if relevant. These could then be considered, for example, in match conditions of ONNX Script pattern rewrite rules.

[justinchuby]

Is there enough information (so the issue can be closed), or do you plan to add more? Thanks

[iksnagreb]

I might add some min/max/number of representable values (for all numeric types) and maybe something for querying exponent/mantissa/whatever bits (for floating-point types) when I find the time to do so (probably when I actually need something like this). It is not that urgent on my side. You could keep the issue open for someone else to consider, or close it to not pile up open issues, both fine for me.

[justinchuby]

Thanks! I will keep it open