fix: support reusing named parameters #240
Merged
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Named parameters that occurred multiple times in the SQL string had to be added to the list of arguments multiple times, even if these were given as named arguments. This fix allows queries that use named parameters to accept only one occurence of the named parameter.
This also clarifies the use of named parameters and positional parameters, and that mixing named parameters with positional arguments is not a good idea.
Based on the issue reported in #237