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I don't speak for the OP, but about the only times when I've done such conversions are
1. to convert numeric ID values, which can occur after importing a text- or comma-delimited spreadsheet file where a column of ID numbers wasn't saved as string (enclosed in double-quotation marks) and some have lost their leading zeros, and
2. to export formatted floating-point numbers to an Excel worksheet where a colleague wants to pretty print them (for example, in a so-called line listing) without having to go to the effort to format the numbers inside Excel.
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