I can understand not wanting the code to shout. However, when you are working with special system variables. They are so compact and non-descriptive they can be problematic to identify and debug. Imagine looking at $/ and meaning to use $\, talk about subtle.
English may have code that SHOUTS but it brings attention to itself with the upper-case syntax and is more descriptive than the built-in variable names. There are good reasons why TheDamian recommended its use in PBP.
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