Fix numericality equality validation on floats #32852
Currently, the numericality validator of active model has trouble with equality of decimal values. Notably, some single decimal floats (eg.
If there's interest in merging this, please let me know how I can improve the decimal regex.
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Test case which was added at rails#32852 passes in Active Model but doesn't pass in Active Record since rails#38210 due to `Float::DIG` has changed to `BigDecimal.double_fig`. ```ruby irb(main):001:0> require 'bigdecimal/util' => true irb(main):002:0> 65.6.to_d => 0.656e2 irb(main):003:0> 65.6.to_d(Float::DIG) => 0.656e2 irb(main):004:0> 65.6.to_d(BigDecimal.double_fig) => 0.6559999999999999e2 ```