mergeE() in javascript producing an error

g.mergeE([(T.id): 'teste-edge', (T.label): 'edge-label', (Direction.from): 'test-vertex', (Direction.to): 'test-vertex2'])

bytecode created seems to be off perhaps for Direction.from where it adds it as from_ according to krlawrence. would be nice to also improve the client-side error for this. it may have been a bit opaque.