Make data.Const comparable with list and dict objects compatible with the layout [0.5 backport]
#1421
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Previously, `KeyError` was raised, which should not be escaping the implementation (`Layout.const` is not a retrieval method).
Before this commit, `data.Const` was only comparable to `data.Const` or
`data.View`.
After this commit, in addition, it is also comparable to `dict` or
`list` provided that such a value is accepted by `layout.const()` where
`layout` is the layout of the `data.Const` object.
This change greatly reduces boilerplate in tests by enabling e.g.:
assert (await stream_get(ctx, stream)) == {"value": 1}
instead of:
assert (await stream_get(ctx, stream)) == Const({"value": 1}, stream.p.shape())
Note that, unlike `Layout.const`, which accepts arbitrary `Mapping` or
`Sequence` objects, only `dict` and `list` are accepted in comparisons.
Also, `data.View` continues to be comparable only to `data.View` and
`data.Const`. This is to minimize the scope of the change and reduce
likelihood of undesirable side effects when backported to the 0.5.x
branch.
Fixes amaranth-lang#1414.
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See #1420.