evalFuture(): Temporarily hide variables in parent environments that … #398

Job	Run time
future.plan=cluster	2m 20s
future.plan=multicore	1m 52s
future.plan=multisession	2m 30s
future.plan=sequential	1m 49s
future.plan=future.batchtools::batchtools_local	3m 48s
future.plan=future.batchtools::batchtools_bash	4m 3s
future.plan=future.callr::callr	2m 52s
	19m 14s

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