Signed-off-by: David Brown <[email protected]>

Flake8 warned that the operator callables were globals. In a previous commit, the operator callables were refactored into method-locals in the operator's constructor. This is sufficient to resolve the flake8 warnings, but introduces a bug: since callables are created per instance, they have different memory locations, and hence, are not compatible with the `Node`-level definition of `__eq__`, which naively compares each `__dict__` of each operand. The fix is to refactor the operator callables into static methods.

Signed-off-by: David Brown <[email protected]>

Signed-off-by: David Brown <[email protected]>

In previous implementations of JSONPath, the current value is implicitly cast to array or object if the next node is an array index subscript or object index subscript. This introduces ambiguity: "is the index subscript referring to the current value, or a child value of the current value?" The solution is to use the wildcard "*" to refer to the child values explicitly.

Signed-off-by: David Brown <[email protected]>

Signed-off-by: David Brown <[email protected]>

Aim for feature parity with equivalent in Python programming language