float32   field1_a # 1.2
float32   field1_b # 3.4
float32   field1_c # 5.6
float32   field1_d # 7.8

SimpleMigrated     field2_a # 11
SimpleMigrated     field2_b # 22
SimpleMigrated     field2_c # 33
SimpleMigrated     field2_d # 44