Fix edge-case positional/named argument handling in image()
#1627
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Fixes #1261
When using named arguments in
image()
ornew /image()
, using a string in the second positional argument will now place an implicitnull
in between the first and second arg. This is what BYOND does:BYOND does this even when there are no named arguments being used. For the sake of performance I'm just ignoring that here in the hopes no one depends on such niche behavior. This does mean keeping the argument-skipping behavior in DreamObjectImage's initializer.