 control files should contain only plain ASCII, because there
     is no way for <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> to know what encoding a
     control file is in.  In practice this is only an issue if you want to
     use non-ASCII characters in the extension's comment.  Recommended
     practice in that case is to not use the control file <TT
CLASS="VARNAME"
>comment</TT
>
     parameter, but instead use <TT
CLASS="COMMAND"
>COMMENT ON EXTENSION</TT
>
     within a script file to set the comme