fix(csv-parse): cast hex, octal and binary literals to their value

[fhgffy]

With cast: true, hex, octal and binary literals are silently turned into 0:

parse("0x10,0o17,0b11", { cast: true });
// [[0, 0, 0]]

__isFloat() (value - parseFloat(value) + 1 >= 0) returns true for these strings because the subtraction coerces with Number(). The value is then read with parseFloat(), which stops at the x/o/b and returns 0.

This uses Number(field) for the conversion so it agrees with the check. For everything __isFloat() already accepted, Number() and parseFloat() give the same result. The only exception is these prefixed literals, which now come out as [16, 15, 3] instead of 0.

I added a case to test/option.cast.ts. It fails before the change, and npm test in packages/csv-parse passes (616 passing).