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Astronomy: the error budget and fit bookkeeping are the audit trail
Decide the uncertainty machinery at design time, because it dictates what you must store. Propagate from the full measurement distribution, Monte Carlo over posterior samples or a full covariance matrix, never from a point estimate plus an error bar, and name the propagation method and which correlations it carries and which it drops.
This is the opening of the README. Read the full README on GitHub.