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update rbs signatures to be more consistent with generics

Status: Open (in progress).

ruby/rbsnumber 2867

#2867 In ruby/rbs;

· sampersand opened on Mar 5, 2026

[Hash] Update Hash's signatures and tests to be correct

Status: Open (in progress).

ruby/rbsnumber 2694

#2694 In ruby/rbs;

· sampersand opened on Oct 31, 2025