Creating an IntEnum programmatically

[goekce]

I have an integer range that I want to encode so that the encoding begins at zero. I used an IntEnum which should act as an encoder and decoder. Because the range is large, I want to create it programmatically. Python IntEnum supports the following, but Amaranth IntEnum with a shape does not:

from enum import IntEnum as pyIntEnum

sum_range = range(4, 21 + 1)
SumEnum = pyIntEnum('SumEnum', {f'SUM_{x}': x-4 for x in sum_range})
display(type(SumEnum))
# enum.EnumType

from amaranth.lib.enum import IntEnum as amaranthIntEnum
SumEnum = amaranthIntEnum('SumEnum', names={f'SUM_{x}': x-4 for x in sum_range}, shape=unsigned(5))
# TypeError: EnumType.__call__() got an unexpected keyword argument 'shape'

What would be the right way to create an Enum programmatically? I am new to Amaranth, so an alternative Amarantish approach is also welcome.

[whitequark]

This is a known bug: #1535

I think if you ask in the IRC/Matrix channel, someone might help you out with it.