math: the error of log2(8) is 4.44e-16 which seems too large

[griesemer]

http://play.golang.org/p/LP2YWj1nEJ

Result is:

2.9999999999999996 4.440892098500626e-16

[ianlancetaylor]

Comment 1:

Currently math.Log2 and math.Log10 are simply written in terms of math.Log.  That
introduces significant imprecision for results like this.  We need a proper
implementation.

Labels changed: added priority-soon, removed priority-triage.

[rsc]

Comment 2:

Owner changed to @rsc.

Status changed to Started.

[rsc]

Comment 3:

codereview.appspot.com/6943074

[rsc]

Comment 4:

This issue was closed by revision a3677b5.

Status changed to Fixed.