| check-scalar-isFlag | R Documentation | 
Does the input contain a boolean flag?
isFlag(x)
| x | Object. | 
TRUE on success;
FALSE on failure, with cause set.
Updated 2019-08-10.
## TRUE ====
isFlag(TRUE)
isFlag(FALSE)
## FALSE ====
isFlag(c(TRUE, TRUE))
isFlag(1)
isFlag(NA)
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