Allow for aligned search of Float and Double

[suXinjke]

It's quite rare for floating point values not to be stored properly aligned, so searching for float value changes results in lot of garbage results. I wish we could search for those values same way we can do 32-bit (aligned) search.

[redwizard42]

This was on my short list of stuff to look into doing, but got distracted by working on sets. I'll see about making at attempt at it.