Declares the class for the Clear FieldConstructor.
Returns it as a B3FieldConstructor to use it as default within a template
Creates a new ClearFieldConstructor to use for specific forms or scopes (don't use it as a default one).
Creates a new ClearFieldConstructor to use for specific forms or scopes (don't use it as a default one). If a default B3FieldConstructor and a specific ClearFieldConstructor are within the same scope, the more specific will be chosen.
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