The 182 the cap is chosen against had no direct case: the existing tests
cover the root chain and the TypedDict field, both of which start one
bracket lower. An array-rooted parameters schema reaches it from a plain
ToolSdkSchema literal, no raw register() needed. Exactly 180 arrays over
a const scalar is the worst case itself -- the root frame starts at
listDepth 0, so every list[ still emits and the innermost Literal[ is
reached rather than degraded; one deeper is where the item degrades.
Name the subscript tool-name comment in pyScalar's docstring: it quotes
through the same JSON.stringify call and inherits the same escapes and
the same pass-throughs.
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