Function builtin_as_r_boolean 

fn builtin_as_r_boolean(
    args: &[RValue],
    _: &[(String, RValue)],
) -> Result<RValue, RError>

Convert to R boolean — used by grDevices and other internal code.

This is equivalent to as.logical(x)[[1]] — coerces to a scalar logical.

@param x object to coerce @return logical scalar @namespace base