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Replace the string-concatenated key in LSP signature help #1954
Description
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Summary
LSP signature help builds a lookup key with format!("{alias}::{name}"), a flat-string encoding the CLAUDE.md type-safety rules forbid. It sits on the tolerant path over raw editor text, so it was left as a boundary concern.
Proposed direction
Key the lookup by a typed (alias, name) pair (or the existing typed path types) instead of a concatenated string.
Activity
Key LSP extern signature help by typed (alias, name)