Pragmas are named in all lowercase.
But not everything that is named in all lowercase is a pragma. Take use lib, for instance. Not a pragma; it globally changes @INC. bignum tried to be a pragma, but gave up halfway.

In reply to Re^3: Pragma clash across modules: bignum and Math::BigFloat (hinthash) by Anonymous Monk
in thread Pragma clash across modules: bignum and Math::BigFloat by Athanasius

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