I see that https://en.wikipedia.org/wiki/SRGB#Translation_to_integers implies what I would call node-centered sampling ("standard" or "mid-tread" in the post), but are you aware of sRGB documentation that precisely specifies the quantization semantics?
Most of what I've read about sRGB focuses on the semantics of continuous (floating-point) R,G,B channels.
Most of what I've read about sRGB focuses on the semantics of continuous (floating-point) R,G,B channels.