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A general description is here.
The ‘"glm"’ method for ‘anova()’ computes test statistics and p-values
by default, using a chi-squared test or an F test depending on whether
the dispersion is fixed or free. Test statistics can be suppressed by
giving argument ‘test’ a false logical value.
‘bs()’ and ‘ns()’ in the (typical) case of automatic knot construction, when some of the supposedly inner knots coincide with boundary knots, now moves them inside (with a warning), building on PR#18442 by Ben Bolker.