bodyWithoutSelf treated a declaration of the function's name at any depth as a rebind,
so a renamed recursive function containing an unchanged `.map((legacy) => legacy)` kept
its old self-call text, no longer matched its base body, and lost its cap ("CC 22 >
target 20 (new code)"). Only the function's own scope (parameters, a named function
expression's name, declarations outside nested functions and classes) now stops the
normalization, and nested functions that bind the name keep their own reads, as the
Python measurer already does.
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