:   '''encoding convertto''' ?''encoding''? ''string''

Convert ''string'' from Unicode to the specified ''encoding''. 
The result is a sequence of bytes (i.e., a byte array) that represents the converted string. 
Each byte is stored in the lower 8-bits of a Unicode character. 
If ''encoding'' is not specified, the current system encoding is used.

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Example of an encoding with "non-null" 0 character: [GSM 03.38 encoding]
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**See also**
   * [encoding]
   * [encoding convertfrom]
   * [encoding names]
   * [encoding system]

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