Equal PersistentOrderedSets are not equal

[FerrumBrain]

In the following example we have two indentical sets that aren’t equal from assertEquals perspective:

val set1 = persistentSetOf(-486539264, 16777216, 0, 67108864)
val builder = set1.builder()

assertEquals(set1, builder)
assertEquals(set1, builder.build())
assertEquals(set1, builder.build().toSet())


val set2 = set1.remove(0)
builder.remove(0)

assertEquals(set2, builder.build().toSet())
assertEquals(set2, builder.build()) // fails, expected to pass

Bug is found by fuzzing team @ PLAN Lab.

[I-Iege]

maybe this is also related to
#198