Wow, and now we finally have trolls in CPAN ratings! How cute.
Like the standard FindBin module, but works under mod_perl and other persistent environments -- the directory is calculated each time in a function call, rather than cached in a global variable. This makes the interface slightly less convenient, and presumably makes it slower as well.
The "Real" suffix on the name is a little misleading: both FindBin and FindBin::Real provide both Bin and RealBin directories (the latter being with links resolved).
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