On Jan 17, 2015, at 12:29 AM, Alexandre (gaumerie) <gaumerie@hotmail.com> wrote:
I was not expecting that behaviour neither. However, it is consistent with what Roberto told during the conversation about the power (x^y) operator: the result type of the operator should depends only on the operandes types and not the operandes values.
If string where converted to integer or float according their values in the addition operation, you would have:
String + Integer -> Integer (if the string represents an integer) or Float (if the string represents a float)
The current behaviour give:
String + Integer -> Float
String + Float -> Float
in all cases (given that the string represents a valid number) and so there is no surprise about the result type.
For me, the “surprise" is that implicit coercion of a string to an integer behaves differently to explicit coercion (via tonumber()). I’m not saying it’s not according to the spec, just that it’s a bit .. well .. surprising.
