proposal: math/big: Int.TrailingZeroBits

[TuomLarsen]

Please consider exposing the nat.trailingZeroBits method, for example as Int.TrailingZeroBits, in addition to Int.BitLen. Similar to math.bits, knowing the length in bits is as useful as counting number of trailing zeros.

[rsc]

Seems reasonable; @griesemer agrees.

[gopherbot]

Change https://golang.org/cl/160681 mentions this issue: math/big: implement Int.TrailingZeroBits

[TuomLarsen]

Thank you!