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string.upperSYNOPSIS
string.upper(s)
DESCRIPTION
Receives a string and returns a copy of this string with all lowercase letters changed to uppercase. All other
characters are left unchanged.
NOTES
This function works for ASCII and ISO 8859-1 codes only. For unicode support, use the UTF8 aware function
string.utf8upper.
RETURN VALUE
Returns a string.
EXAMPLE
>
print(string.upper("tEst"))
TEST