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由 Michael D.W. Prendergast 提交于
Clarify that query methods have a custom definition of whether a numeric value is present. [ci skip] The way Active Record query methods handle numeric values is a special case, and is not part of Rails's standard definition of present. This update attempts to make this more clear in the docs, so that people don't expect Object#present? to return false if used on a number that is zero.
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