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usage: DATATYPE(string,[option])
-without option specified tests whether the string parameter is a valid number and returns either NUM or CHAR
-with option specified returns boolean result
-option keywords (may be abbreviated to 1st character):

KEYWORD: CHARACTERS ACCEPTED:
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Alphanumeric Alphabetics (A-Z,a-z) or Numeric (0-9)
Binary Binary Digits String
Lowercase Lowercase Alphabetics (a-z)
Mixed Mixed Upper/Lowercase
Numeric Valid Numbers
Symbol Valid REXX Symbols
Upper Uppercase Alphabetics (A-Z)
Whole Integer Numbers
X Hex digits string