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The `uchr()` function takes a series of code point values and turns them
into an UTF-8 encoded string. The resulting string will have as many
characters as there were arguments to the function. The number of bytes
per character varies between 1 to 4, depending on the code point value.
Invalid numeric arguments or arguments being out of range 0-0x10FFFF will
be encoded as the Unicode replacement character 0xFFFD.
Returns the resulting UTF-8 string.
-- Testcase --
{{ uchr(0x2600, 0x2601, 0x2602) }}
{{ uchr("inval", -1, 0xffffffff) }}
-- End --
-- Expect stdout --
☀☁☂
���
-- End --
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