Use doubles instead of floats for the time argument in Source:seek. This probably won't affect anything meaningfully, but in theory it's more precise.

src/modules/sound/lullaby/WaveDecoder.cpp

@@ -143,7 +143,7 @@ int WaveDecoder::decode()
 	return (int) size;
 }
 
-bool WaveDecoder::seek(float s)
+bool WaveDecoder::seek(double s)
 {
 	int wuff_status = wuff_seek(handle, (wuff_uint64) (s * info.sample_rate));