Pretty-formats the given S-expression. If this writer is configured to automatically add unit separators, a unit separator is inserted between calls to this function; otherwise this function behaves like {@link nexj.core.scripting.FormattingWriter#format(java.lang.Object,boolean)}.
@param expr The S-expression to write. Considered a single code unit for the purposeof adding unit separators.
@param bDisplay True to display strings without quotes and number without suffixes.
@throws IOException if an I/O error occurs.
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