Exec-next: improve input handling #3461

Job	Run time
lint	31s
system_tests	55s
javascript_test	27s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 23s
mongodb_test (gemfiles/mongoid_8.gemfile)	1m 55s
mongodb_test (gemfiles/mongoid_9.gemfile)	1m 52s
postgres_test (gemfiles/rails_7.2_postgresql.gemfile, 3.3)	2m 27s
test (gemfiles/rails_8.0.gemfile, 3.3, 1)	2m 4s
test (Gemfile, 2.7)	1m 41s
test (gemfiles/rails_8.1.gemfile, 4, 1, 1)	1m 56s
test (Gemfile, head)	1m 40s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1, 1)	2m 30s
	20m 21s

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