CanonicalUnion​(AngouriMath.​Entity.​Set)

A union of numeric intervals and listed real numbers written as its disjoint pieces:
the listed numbers first, in increasing order, then the intervals in increasing order,
a point at an open end closing it and an empty interval dropped. x^2 >= x is
solved to { 0, 1 } \/ (-oo; 0) \/ (1; +oo), which is (-oo; 0] \/ [1; +oo),
and two ways of writing one set of numbers come out the same. null where a piece is anything else, or the union is written so already.
https://github.com/asc-community/AngouriMath/issues/1409