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(elisp)Predicates for Strings

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The Predicates for Strings
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   For more information about general sequence and array predicates,
see Note: Sequences Arrays Vectors, and Note: Arrays.

 - Function: stringp object
     This function returns `t' if OBJECT is a string, `nil' otherwise.

 - Function: char-or-string-p object
     This function returns `t' if OBJECT is a string or a character
     (i.e., an integer), `nil' otherwise.