%INC
contains the list of files included via do or require. The key is the file u specified, value is the actual location of the imported file
%ENV
list of operators supplied by the current environment. The key is the name of the env variable, corresponding value is the variable's value. Setting a single variable in the hash changes the environment variable for child processes.
%SIG
keys of the %SIG are the signals available on the current machine. The values corresponds to how the signal will be handled.
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