Ruby

Optimise primitive unions (#280) #493

Job	Run time
allocations_test (3.2)	26s
rubocop (3.4)	16s
allocations_test (3.3)	23s
allocations_test (3.4)	14s
allocations_test (head)	18s
allocations_test (truffleruby)	30s
allocations_test (truffleruby-head)	48s
ruby-versions / Generate Ruby versions	6s
test (3.1)	15s
test (3.2)	19s
test (3.3)	14s
test (3.4)	10s
test (head)	11s
test (jruby)	39s
test (jruby-head)	46s
test (truffleruby)	24s
test (truffleruby-head)	45s
	6m 44s

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