After re-reading yet another question:
In section "String concatenations" there is no mentioning about
auto-conversion. For statically typed Strings it's rather obvious that
they will be auto-converted if appropriate. Technically - if differently
encode - they seem to be converted to Unicode and the result is
converted to match the target.
Regarding RawByteStrings there has been the definition "a RawByteString
has exactly the same behavior as assigning that AnsiString(X) to another
AnsiString(X) variable with the same value of X: no code page conversion
or copying occurs". Seemingly this is not true for the intermediate
results of concatenations. Here the dynamical encoding information seems
to define the fact and type of conversion. If this is the fact it should
be mentioned. (Whether or not this makes sense is another question: is
the code information of "RawByteString" meant to be "NONE" (i.e. "RAW")
or "dynamic" (i.e. "complex") ).
-Michael
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