My earliest prototype used ascii characters for snakes and fruit. This had a problem - since terminal characters are twice as tall as they are wide, vertical movement felt much faster than horizontal movement:
Number (2): Everything in this space must add up to 2. The answer is 2-1, placed horizontally; 1-6, placed vertically.
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The tee() memory cliff: Stream.share() requires explicit buffer configuration. You choose the highWaterMark and backpressure policy upfront: no more silent unbounded growth when consumers run at different speeds.
The Web streams spec requires promise creation at numerous points, often in hot paths and often invisible to users. Each read() call doesn't just return a promise; internally, the implementation creates additional promises for queue management, pull() coordination, and backpressure signaling.