It's crashing. Segfault in strlen.
Generally, passing nil does the same thing as omitting the argument, and I expected that would be the case here. Maybe that doesn't apply to built-in functions? I haven't really looked into that.
I was doing this in a function that took the filename as an argument and simply forwarded it to cstore. I figured the argument would be optional, but it didn't work out that way.
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