# Functions
Exclusion constructs a RelationTupleTreeNode exclusion operation.
HasThis returns true if there exists a `_this` node anywhere within the given rewrite.
Intersection constructs a RelationTupleTreeNode intersection operation.
Leaf constructs a RelationTupleTreeNode leaf.
Union constructs a RelationTupleTreeNode union operation.
WalkRewrite walks a userset rewrite tree, invoking the handler found on each node of the tree until the handler returns a non-nil value, which is in turn returned from this function.
# Type aliases
WalkHandler is a function invoked for each node in the rewrite tree.