[css-values-4] Distributing multiplication over sums clarification

[danielsakhapov]

The spec says that

Internal representations of math functions are eagerly simplified to the extent possible, using standard algebraic simplifications (distributing multiplication over sums, combining similar units, etc.).

So, the case like calc(2 * (10px - 1rem)) becomes calc(20px - 2rem).

It's not clear to me if we should do the same for when we have functions inside the brackets, like:
calc(2 * (min(10px, 10%) + max(1rem, 1%)) should become calc(2 * min(10px, 10%) + 2 * max(1rem, 1%))?

Currently, no browser does calc(2 * min(10px, 10%) + 2 * max(1rem, 1%)) and just leaves the expression as it is.

So, my question is, should we distribute multiplication over sums in case when the parts are math functions?

@tabatkins @fantasai

[danielsakhapov]

Never mind, I can't read the spec...

But why don't we simplify in case of operands of the sum/sub being non-numeric?

[tabatkins]

The spec doesn't do that distribution, currently, because doing so wouldn't meaningfully simplify the expression.

The current rule means that Product(Numeric, Sum(Numeric, Numeric, Numeric)) can be simplified to Sum(Numeric, Numeric, Numeric), which is a noticeable simplification; we remove one level of nesting.

But if there are math functions, like Product(Numeric, Sum(MathFn, MathFn, MathFn)), distributing the multiplication would leave you with Sum(Product(Numeric, MathFn), Product(Numeric, MathFn), Product(Numeric, MathFn)) - it's no simpler, it just inverts the order of the nested functions.