math/big: Float is not big

[willfaught]

What did you do?

https://pkg.go.dev/math/big#Float

What did you expect to see?

Arbitrary-precision fixed-point decimal numbers

What did you see instead?

A nonzero finite Float represents a multi-precision floating point number

I almost shot myself in the foot with this one.

Please add a huge disclaimer in the Float doc that says it's not big:

BEWARE! THIS IS NOT ARBITRARY PRECISION LIKE INT AND RAT! A nonzero finite Float represents a multi-precision floating point number

[seankhliao]

the following paragraphs describe the levels of precision that Float provides, screaming notice is not in the standard style and should not be necessary.