The entity system in Drupal 7 provides a mechanism to handle all data structures using unified hooks. While this concept was applied to the node system, it was not fully applied to the taxonomy system thus several expected hooks do not exist.
Trigger hook_entity_view and hook_taxonomy_term_view during the display execution for taxonomy term pages.
Selection of an appropriate implementation for Drupal 7 that reduces the chance of introducing compatibility problems.
User interface changes
Both hook_entity_view and hook_taxonomy_term_view would trigger during the page load of a taxonomy term page.
Original report by Dave Reid
We are missing important calls to hook_entity_view() and there is no hook_taxonomy_term_view() unlike all other entities so it makes it hard for an entity-general module (like the Meta tags module) to be able to simply use hook_entity_view() for it's code rather than having to maintain 15 different view hooks.
PASSED: [[SimpleTest]]: [MySQL] 49,426 pass(es). View
PASSED: [[SimpleTest]]: [MySQL] 39,623 pass(es). View
FAILED: [[SimpleTest]]: [MySQL] 39,676 pass(es), 2 fail(s), and 0 exception(s). View