In JS, exponentiation operator is right-associative: `a ** b ** c`

is equal to `a ** (b ** c)`

.

In ReScript is left-associative:

Example:

```
let a = 2. ** 3. ** 2.
```

Compile to:

```
var a = Math.pow(Math.pow(2, 3), 2);
```

Result: `64`

Node:

```
> 2 ** 3 ** 2
> 512
```

Is this the expected behavior?

Why not compile to `Math.pow(2, Math.pow(3, 2))`

?