math/big: Rat.SetFloat64: Inconsistent between document and actual result #17221
Description
What version of Go are you using (go version)?
go1.7
What operating system and processor architecture are you using (go env)?
windows/amd64
What did you do?
https://play.golang.org/p/kkiH1mxD7F
What did you expect to see?
6/5
The document https://golang.org/pkg/math/big says this:
z2 := new(Rat).SetFloat64(1.2) // z2 := 6/5
What did you see instead?
5404319552844595/4503599627370496
I understand the result of the program, as float64 can't represent 1.2 exactly.
If this is the case, the document should be changed; either mention the actual result with explaination, or select value that float64 can represent exactly.