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Hhvm 4.62 introduced the requirements for whitelisting your hh_fixmes.
This didn't break for dependents, only when hammock is typechecked in isolation.
Hhvm 4.68 removed the
array<_>
andarray<_, _>
typehints.Use
varray<_>
anddarray<_, _>
instead for maximum compatibility.HEADS-UP: In older hhvm versions, (d/v)arrayness was not checked at runtime and never versions will error on typehint mismatches.