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When select_or_other is installed, any validator that supports textfield components can be applied to select components because the select component could have an "other" field, which is a textfield. However, most validators can handle only one value and will break of an array of values is given instead, as happens with select multiple.
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Comment #1
Liam Morlandhttp://drupalcode.org/project/webform_validation.git/commitdiff/9e92b10
http://drupalcode.org/project/webform_validation.git/commitdiff/c229470
http://drupalcode.org/project/webform_validation.git/commitdiff/2460f1a
http://drupalcode.org/project/webform_validation.git/commitdiff/cf5e33b
http://drupalcode.org/project/webform_validation.git/commitdiff/0e6bd60