Revert "Remove redundant to_a from Memory::Adapter#join"
Revert "Remove redundant to_a from Memory::Adapter#join"

This reverts commit 0b792bae48565340b5a401656b6745666c06f136.

Seems like it breaks on jruby - needs further investigation!

cored/rom,rom-rb/rom,denyago/rom,kwando/rom,Snuff/rom,endash/rom,dcarral/rom,jeremyf/rom,rom-rb/rom,pdswan/rom,pvcarrera/rom,rom-rb/rom,pxlpnk/rom,vrish88/rom,dekz/rom