Confirmed in 5.18.2 and 5.25.7 on Linux. This is weird, indeed.

What's even weirder is that warn ref $f returns Math::BigInt , but constructors of Math::BigInt and Math::BigFloat are still seen as different: 

warn $_->can('new') for qw( Math::BigInt Math::BigFloat );

[download]

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re: Pragma clash across modules: bignum and Math::BigFloat by choroba
in thread Pragma clash across modules: bignum and Math::BigFloat by Athanasius

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