Treat big ints as floats via feature flag "big-int-as-float"

[richarddd]

Currently simd-json errors when a to large integer overflows while parsing.

This PR adds a feature flag big-int-as-float that handles cases when int overflows and interprets that as a float instead.
The downside is that you loose some precision but that's ok if you opt into it and how it currently works in most JavaScript based engines.

For example:
JSON.parse("999999999999999999999999999999") in Chrome (v8) returns 1e+30

[Licenser]

Good idea 👍 I like it; makes sense that in some places, not failing on icky input is more important than being 100% correct; the only thing could you add a section to the README.md where the other feature flags are listed that explains the flag and the restrictions?

[richarddd]

Good idea 👍 I like it; makes sense that in some places, not failing on icky input is more important than being 100% correct; the only thing could you add a section to the README.md where the other feature flags are listed that explains the flag and the restrictions?

Done! 🥇

[Licenser]

Awesome thank you so much :)

[Licenser]

released as v0.13.7