L#0 returns entire string, some emulations require it to return null
Previous Release Behavior
Format expressions (masks) such as L#0 or R%0 would always return the whole value. For example,
PRINT "Contradiction""L#0" ;* returns "Contradiction"
Current Release Behavior
Format masks specifying a length of zero can now be configured to return null rather than the whole string.
This behavior is activated by setting the following configuration option in the $JBCRELEASEDIR/config/Config_EMULATE (%JBCRELEASEDIR%\config\Config_EMULATE on Windows) file under the emulation section defined by the JBCEMULATE environment variable
format_mask_zero_returns_null = true