AudioBuffer buffer can be null for AudioBufferSourceOptions and ConvolverOptions

[rtoy]

For both AudioBufferSourceOptions and ConvolverOptions, the dictionary contains the member

  AudioBuffer buffer

It is valid for the buffer to be null, so we should write

  AudioBuffer? buffer

[padenot]

Yes, I thought we had another issue about if we want it to be nullable, and what happens when you null it. I don't remember whether we decided.

[foolip]

Even though the spec as it is can be implemented, it does seem unhelpful to throw TypeError for new AudioBufferSourceNode(context, { buffer: null }).

[rtoy]

@padenot I believe it was for .buffer setter.

[padenot]

Right, I remembered right after clicking the "Comment" button.

[rtoy]

OscillatorOptions.periodicWave has the same issue; it can be null.

[rtoy]

WaveShaperOptions.curve can be null.

One of PeriodicWaveOptions.real or PeriodicWaveOptions.imag can be null.