String.to_i unexpected behavior
There's the issue:
"String".to_i => 0
This must be NIL or at least error, but no 0, because the string is not a number, also:
"10String".to_i => 10
Is not 10, because "10String" is not a number, maybe is necessary a new method to get a number from any string, because to_i is to convert into a Integer and that should return an error.