Short-circuits deleting metadata of a specific type by meta ID.

Fires immediately before deleting post or comment metadata of a specific type.

Fires immediately before deleting metadata for a post.

Fires immediately after deleting metadata of a specific type.

Fires immediately after deleting post or comment metadata of a specific type.

Fires immediately after deleting metadata for a post.

Short-circuits the return value of a meta field.

Short-circuits the return value when fetching a meta field by meta ID.

Filters the object subtype identifier for a non-standard object type.

Filters whether a meta key is considered protected.