Tourney_Level column value inconsistencies?

[Iamchristopher]

Some of the tourney_level values appear to be inconsistent with either the data dictionary definition or their use elsewhere.

1. The WTA Finals in 2015 have a tourney_level of 'W'. I think for all other years the finals have a tourney_level of 'F'.

2. In 2021 the following tournaments have a tourney_level of 'W'. Is this intentional?
   'W' isn't used for tournaments in other years (except for the 2015 finals as above).
   Charleston 2 WTA250
   Belgrade WTA250
   Parma WTA250
   Strasbourg WTA500
   Eastbourne WTA500
   Bad Homburg WTA500
   San Jose WTA500
   Cleveland WTA250
   Chicago 1 WTA250
   (I've taken the WTA tournament levels from the WTA website which isn't always the most accurate)

3. The United Cup tournaments in 2023 and 2024 have a tourney_level of 'I'. Are they perhaps 'D' like the other cup competitions?