Math calculations don't minify properly

[Haizlbliek]

If a variable is used inside a math calculation, the whole calculation is not minified.
It probably has something to do with the parenthesis.

Example 1

?(1 * (1 * (1 * (1 * (1 * (1 * (1 * (1 * (x * 1)))))))))

This doesn't get minified, as it has the variable.
However, turning x into a 1 makes the minified result ?1

Expected Result

?x

Actual Result

?1*(1*(1*(1*(1*(1*(1*(1*(a*1))))))))

Example 2

?(1 + (1 + (1 + (1 + (1 + (1 + (1 + (1 + (x + 1)))))))))

This gives the same type of result.

Expected Result

?x+9

Actual Result

?1+(1+(1+(1+(1+(1+(1+(1+(a+1))))))))

Example 3

x = (9 * (2 * y)) * 4

Taking out the parenthesis fixes this problem (Example 4)

Expected Result

x = 72 * y

Actual Result

a=9*(2*b)*4

Example 4

x = 9 * 2 * y * 4

While this fixes the minification problem, it causes a new one: The left and right half are merged separately.

Expected Result

x = 72 * y

Actual Result

a=18*b*4

Outro

Well, that's what I've found so far. Hope it helps with some minification stuff.

[thisismypassport]

Thanks for the suggestion, but I'm not sure this is worth it as:
a) It's really simple to change the parentheses / order to avoid this, and you lose nothing by doing so.
b) If the variable is not a number but a table with metamethods, this optimization will not be correct. (So doing it would require additional checks/flags/etc)