Merge pull request #210 from ifad/bugfix/207-fix-subclasses #377

Job	Run time
Ruby specs (2.6, rails_6.0, stable)	2m 16s
Ruby specs (2.6, rails_6.1, stable)	2m 34s
Ruby specs (2.7, rails_6.0, stable)	1m 52s
Ruby specs (2.7, rails_6.1, stable)	1m 50s
Ruby specs (2.7, rails_7.0, stable)	1m 51s
Ruby specs (3.0, rails_6.0, stable)	1m 43s
Ruby specs (3.0, rails_6.1, stable)	1m 54s
Ruby specs (3.0, rails_7.0, stable)	1m 59s
Ruby specs (3.1, rails_7.0, stable)	2m 13s
Ruby specs (3.2, rails_7.0, stable)	1m 43s
Ruby specs (2.7, rails_edge, experimental)	2m 29s
Ruby specs (3.0, rails_edge, experimental)	1m 45s
Ruby specs (3.1, rails_edge, experimental)	2m 8s
Ruby specs (3.2, rails_edge, experimental)	1m 49s
Ruby specs (head, rails_7.0, experimental)	1m 56s
Ruby specs (head, rails_edge, experimental)	1m 49s
	31m 51s

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