BUG FIX: walkAST() did not recognize objects of type 'object' [#93] #51

Job	Run time
future.batchtools (release)	59s
future.callr (release)	1m 13s
doFuture (release)	7m 8s
future.apply (release)	1m 20s
furrr (release)	1m 53s
doFuture (release) multisession	1m 0s
future.apply (release) multisession	55s
furrr (release) multisession	1m 10s
future.apply (release) keepWhere	1m 14s
future.apply (release) !keepWhere	1m 7s
	17m 59s

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