Refactor number.go Float64() to return errors

- Float64() now returns (float64, error) instead of just float64
- All arithmetic methods (Add, Sub, Mul, Div, Pow, Mod, Compare) return errors
- IsString() and IsSymbol() added to Number interface
- Float and Rat now implement IsString() and IsSymbol()
- StringNum and Symbol updated to implement complete Number interface
- IsZero() updated to use val, _ := Float64() pattern
- ToFloat() updated to ignore error from Float64()}

0 files changed, 0 insertions, 0 deletions