Something like this:

• strict refs This generates a runtime error if you use symbolic references (see perlref).
• strict vars This generates a compile-time error if you access a variable that was neither explicitly declared (using any of my, our, state, or use vars ) nor fully qualified.
• strict subs This disables the poetry optimization, generating a compile-time error if you try to use a bareword identifier that's not a subroutine, unless it is a simple identifier (no colons) and that it appears in curly braces or on the left hand side of the => symbol.

But for warnings options

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