union type check#64

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cs01 wants to merge 3 commits intomainfrom

worktree-union-type-check

Commits on Feb 26, 2026

add closure mutation checker semantic pass that errors on post-capture reassignment
cs01
committed
add union type checker semantic pass that errors on mixed-representation type alias unions
cs01
committed
fix missing setUsesJson in JSON array index codegen causing undefined @csyyjson_arr_get
cs01
committed