Add property typechecks

[vixalien]

When setting a property on an object, the bindings assume the correct type was passed. For example, when setting an uint8 property, the bindings assume that a comparable number was given.

It would be better to check the values given before setting properties. Here are some ways this can improve UX and help reduce programmer errors:

• Emit a warning when a high number value is set for a uint8 (maybe the integer is out of range, or a boolean was passed)
• Warn when a floating type was converted to an integer
• Don't allow setting integers to string properties and vice versa.
• Check if function parameters are correct, too.