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Calling ‘a:b’ when numeric ‘a’ or ‘b’ is longer than one may now be made into an error by setting environment variable ‘_R_CHECK_LENGTH_COLON_’ to a true value, along the proposal in PR#18419 by Henrik Bengtsson.
‘density(x, weights=*)’ now warns if automatic bandwidth selection happens without using ‘weights’; new optional ‘warnWbw’ may suppress the warning. Prompted by Christoph Dalitz' PR#18490 and its discussants.
‘rm(list = *)’ is faster and more readable thanks to Kevin Ushey's PR#18492.