same_length(1:10, letters[11:20]) # TRUE
same_length(1:10, letters[11:19]) # FALSE
a = matrix(1:15, 5, 3)
same_length(a, a) # TRUE
same_length(a, t(a)) # TRUE
different_length(t(a), a) # FALSE
different_length(1:10, a) # TRUE
different_length(a, "a") # TRUE
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