As much as we might want 1 or 2 "sided" or "tailed" to work as a
shorthand (Lord knows, I've tried), they can't because there are
always multiple interpretations, one in terms of directionality, the
other in terms of agreement being too good as well as bad. The only
rigorous solution seems to be to state the hypothesis (and
alternative, if you believe in alternative hypotheses) explicitly.
OTOH, the shorthand can work in individual discussions when the
parties agree what the terms will mean from the start.
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