Make sure it is faster than std::to_value(). And it is, by ~30% for
the normal use case, and much faster when close to the double limits.
util::dtoa also offers a much better precision.
To obtain precise results, we:
1. Round scale value to obtain same results from symbol shader.
2. Generate a boost geometry polygon to check if it intersects()
against all feature boxes.
3. Check if current scale is within each feature's minimum and maximum
placement scales.
4. De-scale feature boxes when intersecting to account for the
fractional zoom scaling.
