[Backport support/2.16] Restore single-argument Json.decode() in the DSL#10921
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The recursion depth limit added to JsonDecode() in 2.16.2 gave the C++
function a second parameter with a default value. Function pointers do not
carry default arguments, so the DSL function binding deduced an arity of 2
via boost::function_types::function_arity and required two arguments. As a
result `Json.decode("...")` failed with "Too few arguments for function",
an undocumented breaking change in a patch release.
Wrap JsonDecode() in a single-argument shim (mirroring the existing
JsonEncodeShim) so the registered function keeps its one-parameter contract
while still applying the default depth limit internally.
refs #10913
(cherry picked from commit d29ac49)
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Backport of #10914 to
support/2.16, triggered by a label.This is an automated backport PR. Please review it carefully before merging.