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Description
In #581 and #2854 we resolved to add a generic interpolation function, which takes a percentage, a start value, and an end value.
One outstanding question is: where is this notation valid?
- It definitely needs to be valid as a top-level function that wraps the entire property's value.
- Can it also be used as a lower-level syntax, e.g. for interpolating
<length>
values? What about<position>
values (which have multiple components)?