The object caches weigh what each cached object owns, but the walk
stopped four levels down and counted anything deeper as nothing. Many
objects holding a large string inside a few nested arrays stayed cached
far past the byte budget (34 MiB against 32 MiB in the test, and without
limit as objects grow). The walk now goes past the parser's nesting
limit; anything deeper counts as too large to keep.
aiongg
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