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Allow use of faster floating-point number parsing (Schubfach) with StreamReadFeature.USE_FAST_DOUBLE_PARSER #577

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@cowtowncoder

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@cowtowncoder

Jsoniter project (https://github.com/plokhotnyuk/jsoniter-scala) has many impressive performance optimizations; linked f.ex from here:

https://www.reddit.com/r/java/comments/darehu/jackson_release_210/f1ysf1e/

Of ones included, number-parsing would be relevant for this repo.

EDIT: also see (from the comment below)

"Unrelated to jsoniter but this recent port of Lemire's Double parser:

https://github.com/wrandelshofer/FastDoubleParser

and the original paper https://arxiv.org/abs/2101.11408 also relevant"

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