Decrement leaf count in simple SMT when inserting empty value #303
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I realized the Simple SMT does not remove empty values from its
leaves
vector upon insert. This would have led to an incorrect leaf count after anEMPTY_VALUE
is inserted into the tree. This PR fixes this.Also, I renamed
leaf_count()
tonum_leaves()
as it is more consistent with our naming methodology and added a simple test to ensure that leaf count behaves as expected.