# %nodes = (
#
# <op-name> => {
-# "op_flags" => "N|L|C|X|I|F|Y|H|c",
+# "op_flags" => "N|L|C|X|I|F|Y|H|c|K",
# "arity" => "0|1|2|3|variable|dynamic|all",
# "state" => "floats|pinned",
# "args" => [
# Y irop_flag_forking
# H irop_flag_highlevel
# c irop_flag_constlike
+# K irop_flag_keep
#
# op_flags: flags for the operation, OPTIONAL (default is "N")
#