Possible change to string add method

[mike000000000]

The string add is used by the "+" operator. We decided to generally not do auto cast and we decided to not have a special "concatenate" operator. The main reason for not doing auto cast in the string add is because 2 + '2' will yield "22", which can be an unintended/unexpected result. For strings, afw also has the concat() function that does concatenate of the string values of all parameters, including the first.

We've probably already discussed this as a possibility before, but I propose that we change the string add to convert all except the first parameter to it's string value. This change is only for the '+' operator and no other functions. Here are some results:

expression	ECMAScript result	AFW result
2 + '2'	'22'	error because the integer add operator only accepts integer parameters.
1 + 1 + '2'	'22'	error because the integer add operator only accepts integer parameters.
'2' + 2	'22'	'22' because intent to be string indicated up front.

This last example seems like a useful pattern.

One common ways some languages force a string concatenation when the concatenated value are a mixture of string and numbers is to start it with an empty string ""+. This will work if we make this change.

[mike000000000]

@JeremyGrieshop I'm finished with this unless you find something I need to fix.