wrt numbers in JavaScript...All numbers in JavaScript are stored as 64-bit (8-bytes) base 10, floating point numbers. This will probably provide enough space for your IDs.
This is only true if you assume my IDs start with 0/1, and slowly grow. I also use Java longs to store 64-bit MurmurHash of Strings (class names, ...), which cover the whole "bit range" of a long. This has the great advantage that it allows things that would otherwise be "variable size" to then be "fixed size" when serialized.
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