Sounds can set both preload and stream at the same time.

The bug

Since the underwater ambience got added, sounds got an option to preload ("preload":true|false).
This can be set at the same time stream ("stream":true|false) gets set, which is contradictory as a sound cannot both be streamed and preloaded at the same time.
It seems preload takes preference.

The fix

Instead of having a separate identifier for stream and preload, have one for the way sound is handled (eg "load": "arbitrary|stream|preload").