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Tests if an object is a single TRUE
is_single_true(x)
an R object
is_single, is_single_false
is_single_true(TRUE) # TRUE
is_single_true(FALSE) # FALSE
is_single_true(c(TRUE, FALSE)) # FALSE
is_single_true(-1.0) # FALSE
is_single_true(0) # FALSE
is_single_true(NA) # FALSE
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