ngTrueValue and ngFalseValue now support parsed expressions which the parser determines to be constant values.
BREAKING CHANGE:
Previously, these attributes would always be treated as strings. However, they are now parsed as
expressions, and will throw if an expression is non-constant.
To convert non-constant strings into constant expressions, simply wrap them in an extra pair of quotes, like so:
<input type="checkbox" ng-model="..." ng-true-value="'truthyValue'">
Closes#8041Closes#5346Closes#1199
