Changed logic behind identification of special template values - #928

Possible null reference argument for parameter 'prop' in 'CellWriteInfo.CellWriteInfo(object? value, int cellIndex, MiniExcelColumnInfo prop)'.

Possible null reference argument for parameter 'key' in 'object IDictionary<string, object>.this[string key]'.

Possible null reference argument for parameter 'name' in 'int IDataRecord.GetOrdinal(string name)'.

Non-nullable field '_keys' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field '_keys' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Nullability of reference types in return type of 'object? MiniExcelDataReaderBase.this[string name].get' doesn't match implicitly implemented member 'object IDataRecord.this[string name].get' (possibly because of nullability attributes).

Nullability of reference types in return type of 'object? MiniExcelDataReaderBase.this[int i].get' doesn't match implicitly implemented member 'object IDataRecord.this[int i].get' (possibly because of nullability attributes).

Nullability of reference types in return type of 'object? MiniExcelDataReaderBase.GetValue(int i)' doesn't match implicitly implemented member 'object IDataRecord.GetValue(int i)' (possibly because of nullability attributes).

Nullability of reference types in return type of 'IDataReader? MiniExcelDataReaderBase.GetData(int i)' doesn't match implicitly implemented member 'IDataReader IDataRecord.GetData(int i)' (possibly because of nullability attributes).

'MiniExcelAsyncDataReader.DisposeAsync()' hides inherited member 'MiniExcelDataReaderBase.DisposeAsync()'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.

Cannot build an overlay database because build-mode is set to "undefined" instead of "none". Falling back to creating a normal full database instead.