In perl on windows you will get a warning for every subroutine in a Module being redefined, if somewhere in your code (or in some submodule) the given Module is used or required with the correct case, and somewhere else it is loaded with a missmatched case. e.g. in one place it is loaded using the correct case:

use Time::HiRes;
[download]

an it is loaded somewhere else with the wrong case:

# missspelled module name 
use TIME::HiRes;
[download]

Since TIME::HiRes is not loaded yet (only Time::HiRes is loaded), it will be loaded again, thus redefining the subroutines. The cause is Perl being case sensitive and the windows filesystem being case insensitive.

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