template: sort map keys before iteration?

[rsc]

Template already obtains a []reflect.Value giving the map keys
for a {{range}} over a map.  It would be a tiny amount more effort
to look at the key kind and sort (when comparable) before iteration,
using one of:

type rvs []reflect.Value
func (x rvs) Len() int { return len(x) }
func (x rvs) Swap(i, j int) { x[i], x[j] = x[j], x[i] }

type rvInts struct { rvs }
func (x rvInts) Less(i, j int) { return x.rvs[i].Int() < x.rvs[j].Int() }

type rvUints struct { rvs }
func (x rvUints) Less(i, j int) { return x.rvs[i].Uint() < x.rvs[j].Uint() }

type rvFloats struct { rvs }
func (x rvFloats) Less(i, j int) { return x.rvs[i].Float() < x.rvs[j].Float() }

type rvStrings struct { rvs }
func (x rvStrings) Less(i, j int) { return x.rvs[i].String() < x.rvs[j].String() }

[robpike]

Comment 1:

Labels changed: added priority-go1.

[robpike]

Comment 2:

Owner changed to builder@golang.org.

[robpike]

Comment 3:

This issue was closed by revision a5950df.

Status changed to Fixed.