These are building blocks for the form library, defining fields that
can be created using set_fieldtype(3X). Each provides functions for
field- and character-validation, according to the given datatype.
This holds alphanumeric data.
This holds alphabetic data.
This holds an enumerated type.
This holds a decimal integer.
This holds an IPv4 internet address, e.g., "127.0.0.1".
This holds a decimal number, with optional sign and decimal point.
This holds a regular expression.
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