Add Int64 metatable marker to distinguish 64-bit values from arrays#3
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The bit64 module uses {high, low} tables to represent 64-bit integers,
which are indistinguishable from regular 2-element arrays. This causes
issues when code needs to differentiate between Int64 values and arrays
(e.g., protobuf encoders checking for repeated fields).
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The bit64 module uses {high, low} tables to represent 64-bit integers, which are indistinguishable from regular 2-element arrays. This causes issues when code needs to differentiate between Int64 values and arrays (e.g., protobuf encoders checking for repeated fields).