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### Tests that nested collections force outer ones to split.
>>> Nested non-empty list forces outer map to split.
map = {key: [inner]};
<<<
map = {
  key: [inner],
};
>>> Nested non-empty map forces outer map to split.
map = {key: {key: inner}};
<<<
map = {
  key: {key: inner},
};
>>> Nested non-empty set forces outer map to split.
map = {key: {inner}};
<<<
map = {
  key: {inner},
};
>>> Nested non-empty record does not force outer map to split.
map = {key: (inner,)};
<<<
map = {key: (inner,)};
>>> Nested empty collection does not force outer map to split.
map = {a: [], b: {}, c: ()};
<<<
map = {a: [], b: {}, c: ()};
>>> Indirect nesting still forces a split.
map = {a: function({b: inner})};
<<<
map = {
  a: function({b: inner}),
};
>>> Multiple nested collections.
var m = {first: 1, second: [third, fourth], fifth: 5, nested: {sixth: seventh, eighth: nine,
    tenth: eleventh}};
<<<
var m = {
  first: 1,
  second: [third, fourth],
  fifth: 5,
  nested: {
    sixth: seventh,
    eighth: nine,
    tenth: eleventh,
  },
};