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arpra
Arpra is a C library for analyzing the propagation of numerical error in arbitrary precision IEEE-754 floating-point computations.
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InfluxDB
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I don't know why everyone else is talking about bignums, but this is a fairly common subject of interest with lots of research projects out there. Off the top of my head Arpra, and CADNA. Julia also has IntervalArithmetic.jl which can be used with some manual work. None of these are core language features, but I don't imagine that was an important part of the question.
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