RFC: "Remove Const.normalize"

Author: whitequark

text/0000-remove-const-normalize.md

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+- Start Date: (fill me in with today's date, YYYY-MM-DD)
+- RFC PR: [amaranth-lang/rfcs#0000](https://github.com/amaranth-lang/rfcs/pull/0000)
+- Amaranth Issue: [amaranth-lang/amaranth#0000](https://github.com/amaranth-lang/amaranth/issues/0000)
+
+# Summary
+[summary]: #summary
+
+Remove `Const.normalize(value, shape)`.
+
+# Motivation
+[motivation]: #motivation
+
+From the name it is not clear what it is supposed to achieve (it's truncation and inversion according to the shape) and it does not check types of arguments.
+
+We already have `Const(value, shape).value` and most developers should be aware of it. Having `Const.normalize(value, shape)` as well provides no benefit over the former. It's also longer.
+
+# Explanation
+[explanation]: #explanation
+
+The `Const.normalize` method is deprecated (with the suggestion to use `Const().value`) and removed.
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+- Churn.
+
+# Rationale and alternatives
+[rationale-and-alternatives]: #rationale-and-alternatives
+
+We could keep it. Removing it reduces the API surface and makes the language a bit more elegant.
+
+# Prior art
+[prior-art]: #prior-art
+
+None.
+
+# Unresolved questions
+[unresolved-questions]: #unresolved-questions
+
+None.
+
+# Future possibilities
+[future-possibilities]: #future-possibilities
+
+None.