On the importance of this bug: In a way "./" is the neutral element in pathes in the sense of adding it anywhere in the path does not change anything (except in the middle of a name obviously).
One exception springs to mind: When executing a command it does make a difference whether to say
system("somecommand"); # or
system("./somecommand");
Whether or not this can happen due to the usage of basename('') in any practical example I am not sure.
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