if var a = true then a == 1 is true but a == 2 is false. Why? [duplicate]

Answer 1

This is to do with coercion. In the a == 1 scenario, a is coerced into a an integer to compare again 1, true is coerced to 1. In the second example, a is again coerced to 1, so it doesn't equal 2.

Further reading on coercion