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fix: limit exponents accepted by NewFromString and UnmarshalBinary - #440
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Fixes #226.
Parsing
1e-1000000000is fast, but using the result (String,Add,Float64, ...) can hang the process or use gigabytes of memory.This adds
MaxDecodeExponent(default 10,000).NewFromStringandUnmarshalBinarynow return an error for larger exponents. JSON, text, SQL, gob and Spanner decoding all go through these two functions.Behavior change: inputs with larger exponents that parsed before now fail. Set
MaxDecodeExponenthigher at startup if you need them.Replaces #427.