PQgetvalue returns a value of type char* (without const). But the
documentation says:
"The pointer returned by PQgetvalue points to storage that is part of the
PGresult structure. *One should not modify the data it points to*" (my
italics). Could someone tell me please, what wrong with modifing arbitrary
character of the data pointed by PQgetvalue's returning value? Or why this
restriction is documented? Thanks.

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