Function: to_real

DOC_MSE_VERSION: since 0.3.7

--Usage--
> to_real(any value)

Convert any value to a [[type:double]].


--Parameters--
! Parameter	Type			Description
| @input@	''any type''		Value to convert to a real number

--Examples--
> to_real(1)     == 1.0
> to_real("1.5") == 1.5

Use @or else@ to recover from errors:
> to_number("not a number") or else 0.0  ==  0.0
> to_number("123")          or else 0.0  ==  123.0

--See also--
| [[fun:to_int]]		Convert any value to a [[type:int]]
| [[fun:to_number]]		Convert any value to a number
