We have some code in Trixi.jl that checks

if :i_backward in secondary_indices

where, secondary_indices is a tuple of Symbols, see https://github.com/trixi-framework/Trixi.jl/blob/07981c3e50943a9bdb1a845f918a4e8831714338/src/solvers/dgsem_p4est/dg_2d.jl#L148

We observed a significantly increased amount of allocations when checking CI with Julia v1.10.0-alpha1 in trixi-framework/Trixi.jl#1562. Locally, I checked that the allocations are gone when modifying the code above to

if any(==(:i_backward), secondary_indices)