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The `uc()` function turns each lower case character in the source string
into upper case and returns the resulting copy.
The input argument is converted to a string in case it is not already a
string value.
-- Testcase --
{%
printf("%.J\n", [
uc("This Will Be All Uppercased."),
uc([ "An", "array", "ABC" ]),
uc(123),
uc(false),
uc()
]);
%}
-- End --
-- Expect stdout --
[
"THIS WILL BE ALL UPPERCASED.",
"[ \"AN\", \"ARRAY\", \"ABC\" ]",
"123",
"FALSE",
"NULL"
]
-- End --
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