Reads a Variant value from the reader object's stream and returns its value.
function ReadVariant: Variant;
__fastcall Variant ReadVariant();
ReadVariant is a helper method used by other reader methods to read a tagged Variant data value at the current reader Position. ReadVariant first checks the value type (TValueType) by calling the ReadValue method. If the item is a vaVariant ReadVariant calls Read and returns the value. Otherwise it calls ReadInteger.
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