Deprecated spellings still accepted for a parameter, mapped to the current
key. Empty today: the 2026-09 camelCase rename was a pre-release hard cut.
This table is the mechanism a POST-release rename uses — add
'old-spelling': URL_PARAM_KEYS.newSpelling, and readUrlParams
keeps honoring the old URL while warning once per page load, for the
deprecation window the compatibility policy sets (two releases or six
months, whichever is longer).
Deprecated spellings still accepted for a parameter, mapped to the current key. Empty today: the 2026-09 camelCase rename was a pre-release hard cut. This table is the mechanism a POST-release rename uses — add
'old-spelling': URL_PARAM_KEYS.newSpelling, and readUrlParams keeps honoring the old URL while warning once per page load, for the deprecation window the compatibility policy sets (two releases or six months, whichever is longer).