Decimal notation can have a fractional part (example: `12.25`

).

Binary, octal and hexadecimal notations only allow to write integers (example: `0xff80`

).

I suggest to allow binary, octal and hexadecimal notations to have a fractional part.

Example:

```
0b1100.01 // = 12.25
0o14.2 // = 12.25
0xC.4 = 12.25
```

I would like to point out that `Number.prototype.toString(base)`

already supports fractional numbers:

```
12.25.toString(2) // = '1100.01'
12.25.toString(8) // = '14.2'
12.25.toString(16) // = 'c.4'
12.25.toString(3) // = '110.0202020202020202020202020202021'
12.25.toString(36) // = 'c.9'
```

`Number.parseFloat()`

(and `parseFloat()`

) should also support `base`

parameter as `Number.parseInt()`

does:

```
Number.parseFloat('1100.01', 2) // = 12.25
Number.parseFloat('14.2', 8) // = 12.25
Number.parseFloat('C.4', 16) // = 12.25
Number.parseFloat('20.1', 3) // = 6.3333333333333333333
Number.parseFloat('12.45', 7) // = 9.673469387755102
Number.parseFloat('hello.world', 36) // = 29234652.90799883
```