mDiyo/TinkersConstruct — pull request #102 by AartBluestoke (2013-08-17 01:01:48+00:00)
Title: copy on insert, to avoid using an external object

the copy is avoided if there is already some of the same liquid in the tank.
Without this patch after a fill(dir,resource,true); the callee changing resource (eg resource.amount=10;) modifies the internal contents of the smeltery.