irate is bad

[bboreham]

#619 was a mistake.

irate() uses only the last two samples in a range, completely discarding all the other samples.
Discarding data is bad in observability, on principle.

Supposedly the benefit is to "see in finer detail". But only a portion of the data is seen in detail, the rest is discarded.
Bad.

[bboreham]

See also #670

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[bboreham]

Still bad.