ToNumber incorrectly accepts "INFINITY"

[gibson042]

Environment: XS 11.6.0 32 4

Description
XS incorrectly converts a string like "INFINITY" into Infinity rather than NaN.

Steps to Reproduce

const inputs = ["Infinity", "INFINITY", "infinity", "inFiNiTY"];
inputs.map(str => `Number("${str}") // => ${Number(str)}`).join("\n");
// =>
// Number("Infinity") // => Infinity
// Number("INFINITY") // => Infinity
// Number("infinity") // => NaN
// Number("inFiNiTY") // => NaN

Expected behavior
Only the "Infinity" capitalization should be given special treatment, with all other variants converted to NaN per StringToNumber parsing input against StringNumericLiteral.

Actual behavior
XS privileges both "Infinity" and "INFINITY".

[phoddie]

The bug appears to happen because the match function used by dtoa2 is case insensitive.

The only other place match is used is to detect NaN. But there's no problem there because "NAN" evaluates to NaN anyway.

So, it looks like it would be enough to modify match to be case-sensitive.