use XString instead of B::perlstring

[atoomic]

Note that this is also avoiding an implicit
load of B coming from Specio.

[tobyink]

B is a core module. XString would introduce an additional dependency.

What would be the advantage of this?

[atoomic]

The main advantage is memory saving as you do not need all utils from B
XString provides that single helper and avoid the bloat

[tobyink]

$ perl -MTypes::DateTime -E'say for sort keys %INC' | wc -l
126

B.pm accounts for about 2k of memory out of the roughly 50k of modules that Types::DateTime loads. It introduces an additional dependency for a 4% memory saving at best.

(And if your project also loads B.pm via some other dependency, you'll get both loaded, and it will actually cost you more memory.)