Fix is-int and is-float attributes of number using as-bytes

[c71n93]

We are planning to make eq attribute to be an atom objectionary/eo#2547.
Attributes is-float and is-int of object number assumes, that 0.0 is not equals to -0.0. After closing objectionary/eo#2547 this won't be true. Thus, we need to move logic of 0.0 and -0.0 comparison from current eq attribute to is-float and is-int attributes, and compare this values "as-bytes".