Fix SIGSEGV when reading an Object before it's been written (#5) - #6
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readObject/writeObjectreinterpret raw Buffer memory directly as aNapi::Reference<Object>, with no check that the bytes actually hold a previously-written reference. CallingreadObjecton a buffer that was never written to (or filled with non-zero garbage) causes N-API to dereference a bogus handle, segfaulting the whole process.This adds a magic-marker tag written by
writeObjecton first use.readObjectnow throws a catchableErrorwhen the marker is missing, instead of dereferencing untrusted memory.writeObjecton unmarked memory safely bootstraps a fresh reference in place.