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PL_BLOB_UNIQUE set, search
the blob database for a blob of the same type with the same content. If
found, unify t with the existing handle.
PL_BLOB_UNIQUE is not set, create a new
blob handle. If
PL_BLOB_NOCOPY is set, associate it to the
given memory; else, copy the memory to a new area owned by the blob.
Call the acquire()
function of the type.
It is possible that a blob referencing critial resources is created after which the unification fails. Typically these resources are eventually reclaimed because the new blob is not referenced and reclaimed by the atom garbage collector. As described with the release() function, it can be desirable to reclaim the critical resources after the failing PL_unify_blob() call.