While working on T200968 we noticed tabular data (and NOT map data) strip out all comments from the initial JSON.

Example:

1. https://commons.wikimedia.org/w/index.php?title=Data:TEST2.tab&action=edit
2. https://commons.wikimedia.org/w/index.php?title=Data:TEST2.map&action=edit

Expected: (assuming TEST2 doesn't exist) We should expect the default JSON, including the comments to appear in the preload.

Note: comments are not standard in JSON and we do want to strip them out on save.

Actual: For .map the preload includes comments, for tabular data it doesn't