in reply to Checking whether a value is between two limits: Useless use of private variable in void context

You've got => which is a fancy comma not the greater than or equals operator >= (see perlop). This means the second half of your if check is ... ( $value, $lower_limit ) which is why you're getting that warning.

The cake is a lie.
The cake is a lie.
The cake is a lie.

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