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(slib.info)Type Coercion

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Type Coercion
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  `(require 'coerce)'

 - Function: type-of obj
     Returns a symbol name for the type of OBJ.

 - Function: coerce obj result-type
     Converts and returns OBJ of type `char', `number', `string',
     `symbol', `list', or `vector' to RESULT-TYPE (which must be one of
     these symbols).