3.5.5 Numbers with arbitrary size and precision

JSON can represent numbers with arbitrary size and precision. U64JSON can only represent signed and unsigned 64-bit integers and 64-bit double-precision floating point values.

Interfaces that support larger numbers or bit patterns must represent them using JSON values that can hold an arbitrary amount of data. For example, NumberU64[] is used by the resources and memory interfaces to represent arbitrarily wide bit patterns.

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