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did not release the
JSClosure
itself and it leaked the underlyingJavaScript closure too because
JSClosure
-> JS closure thunk ->Closure registry entry ->
JSClosure
reference cycle was not brokenwhen using FinalizationRegistry. (Without FR, it was broken by manual
release
call.)Note that weakening the reference does not violates the contract that
function reference should be unique because holding a weak reference does
deinit but not deallocate the object, so ObjectIdentifier is not reused
until the weak reference in the registry is removed.