=> R0 = buffer handle
R1 = line number, or 'special' codes
Sets the position in a private history buffer.
Special position codes
Value Position
-ve Number of lines from end of history
&7FFFFFFF End of buffer
&80000000 previous line, wrapping to end
&80000001 previous line, stopping at start
&80000002 next line, stopping at end
&80000003 next line, wrapping to start
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