Support numeric sort in ByParam

[smiileTeam]

hugo/hugolib/pageSort.go

Line 295 in f1a00b2

func (p Pages) ByParam(paramsKey interface{}) Pages {

On this method, each value is cast to string so a compare beetwen (int) 9 and (int) 12 gives us 9 result first (instead of 12).
We would love to:

• have an option to specify we want an order on ints
  or
• have a new method ByIntParam which would do it
  or
• maybe something that detect both v1 & v2 are ints and compare them without casting

[bep]

maybe something that detect both v1 & v2 are ints and compare them without casting

I suggest we do a variant of the above.

• The different decoders (JSON, TOML, YAML) treats numbers differently, so an int may be int, int64 and I think even float64
• If you in one page say myparam = 2 and in another say myparam = 2.2, I think most people expect them to be compared as numbers (2 comes before 2.2)

With that, I suggest that: If both are numbers, convert both to float64 and compare them.

[smiileTeam]

Nice, thanks