[whatwg/streams] What are the preconditions for ReadableStreamDefaultControllerError? (#920)

https://streams.spec.whatwg.org/commit-snapshots/37ace3d5f16cbea7aec4a0c80532c95059994d51/#readable-stream-default-controller-error

says

> Specifications ... must ensure they have obeyed the precondition (listed here as an assert).

but there is no assert.

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