Keep original subclasses method in 7.0 #366

Job	Run time
Ruby specs (2.6, rails_6.0, stable)	2m 6s
Ruby specs (2.6, rails_6.1, stable)	2m 32s
Ruby specs (2.7, rails_6.0, stable)	2m 13s
Ruby specs (2.7, rails_6.1, stable)	1m 55s
Ruby specs (2.7, rails_7.0, stable)	1m 56s
Ruby specs (3.0, rails_6.0, stable)	1m 46s
Ruby specs (3.0, rails_6.1, stable)	1m 48s
Ruby specs (3.0, rails_7.0, stable)	2m 10s
Ruby specs (3.1, rails_7.0, stable)	1m 48s
Ruby specs (3.2, rails_7.0, stable)	2m 2s
Ruby specs (2.7, rails_edge, experimental)	6h 0m 3s
Ruby specs (3.0, rails_edge, experimental)	2m 3s
Ruby specs (3.1, rails_edge, experimental)	2m 2s
Ruby specs (3.2, rails_edge, experimental)	1m 51s
Ruby specs (head, rails_7.0, experimental)	2m 11s
Ruby specs (head, rails_edge, experimental)	2m 11s
	6h 30m 37s

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