Sets the given attribute to the given value
Source: stdlib.ngs:147
Returns
The modified obj
Example
s.len() != 1 throws InvalidArgument("ord() argument must be of length 1 exactly").set('given', s)
# Would else be written as
if s.len() != 1 {
e = InvalidArgument("ord() argument must be of length 1 exactly")
e.given = s
throw e
}