Speaking of string concatenation, you have to watch out for concatenations involving string literals. For example consider the following apparently trivial lines of code:
Log ( 'String: ' + strl); Log (strl + ' is a string');
Now if strl is a UnicodeString, there should be no problem at all. If strl is an AnsiString, in one of its variations, the concatenation with a Unicode string literal might force different conversions depending whether the string literal comes before or after the string variable. In most mixed string cases involving literals, my suggestion is to add an explicit type cast for the string, like in:
Log ('String: ' + UnicodeString(strl)); Log (unicodeString(strl) + ' is a string');
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