MongoDB doesn't support "." in field names, so a Private Use Area character was used. This was originally stored in unicode format, but delomboking the code caused it to get transformed into another encoding. This causes issues on certain systems when building the software, so we are converting it back to its unicode representation. The character has been the same throughout, ensuring binary compatilibity.
See: https://www.compart.com/en/unicode/U+F607
Related: d601e270fc (diff-57190a47726099e31fdf86b12b80206e2ae24feb28aacaf494b99557583df150L47)Closes#2053.
