SetHex or SetString equivalent

[t-anyu]

Hey,

it would be nice to have a math/big.Int SetString equivalent so that we can re-use Int objects without releasing to GC. Maybe just expose (z *Int) fromHex(hex string)?

Thanks

[holiman]

Well, there's always

// UnmarshalText implements encoding.TextUnmarshaler
func (z *Int) UnmarshalText(input []byte) error {
	return z.fromHex(string(input))
}

But perhaps you want the ability to do SetString("500", 10) and choose the base?

I don't really se any problem with changing fromHex into FromHex, tbh. Although, I guess it cannot be exposed in it's current form -- as we have it now, the FromHex guarantees that the z is clear, and thus it doesn't have to set all components (only the ones that are used). If we expose it, we need to ensure to clear any prior bits.

Edit, should be fine