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=============================== warnings summary ===============================
tests/unit/test_fix_pmm2d_mortar_round2.py::test_the_mortars_own_algebra_is_exact_at_every_wall_separation
  /mnt/c/tmp/lum_vmortar3/lumenairy/elements/pmm/stack2d_pure.py:1340: UserWarning: PMM2DStackPure.solve: layer 1's element grid has a segment 1.000e-02 of the period wide on the x axis (walls [0.    0.594 0.606 1.2  ]).  That is ABOVE the 1e-03 minimum this basis contracts for, so the solve proceeds -- but it is inside the MEASURED degradation band 1e-03 .. 3e-02, where the per-segment 1/J_n stiffness puts spurious modal wavenumbers into the L2 MORTAR that couples this layer to neighbours on other grids.  MEASURED cost on a device that cannot depend on the wall separation at all: about 4-5x the error of the same device on an ordinary partition, and it is a FLOOR -- raising n_modes does NOT remove it, and the n_modes ladder FLATTENS here, so a convergence study will read the floor as convergence.  The lossless closure stays pinned, so no energy tripwire can see this.
    REMEDIES.  (1) MERGE the two walls if the feature is finer than the device needs; (2) carry the fine feature on the SHARED lattice (PMM2DStackPure(..., layer_grids='shared') with an N that resolves it), where every cell is period/N and no mortar forms; (3) put the NEIGHBOURS on this layer's wall array too -- a CONFORMING per-layer stack takes the plain square modal match and no mortar at all; (4) use PMM2DStackHybrid, which is Fourier-projected and has no element grid; (5) on a TAPER, lower n_slices.  To silence this warning after reading the measurement, set lumenairy.elements.pmm.twod_staggered.PMM2D_STAG_SLIVER_BAND_WARN = False.
    return self._solve_per_layer(jones=jones,

tests/unit/test_fix_pmm2d_mortar_round2.py::test_the_mortar_rcond_bar_has_decades_of_gap_on_both_sides
tests/unit/test_fix_pmm2d_mortar_round2.py::test_a_singular_mortar_operator_is_refused_by_name_not_by_LinAlgError
  /mnt/c/tmp/lum_vmortar3/lumenairy/elements/pmm/twod_staggered.py:2510: RuntimeWarning: invalid value encountered in multiply
    lam = -1j * q                     # forward propagator exp(-lam k0 z) decays

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
============================= slowest 15 durations =============================
65.44s call     tests/unit/test_pmm2d_staggered_oop.py::test_g5_no_fourier_floor_two_sided
56.17s call     tests/unit/test_fix_pmm2d_mortar_round2.py::test_fail_before_the_sliver_the_guard_refuses_is_measurably_wrong
38.92s call     tests/unit/test_verify_pmm2d_perlayer_slant.py::test_slanted_split_across_non_conforming_grids_matches_the_1d_oracle[28.0-22.0]
35.27s call     tests/unit/test_pmm2d_staggered_mortar.py::test_taper_agrees_with_the_hybrid_staircase_at_the_same_slices
34.28s call     tests/unit/test_verify_pmm2d_perlayer_slant.py::test_slanted_per_layer_on_coinciding_grids_is_bit_exact_vs_shared
33.66s call     tests/unit/test_fix_pmm2d_mortar_round3.py::test_no_ordinary_geometry_the_library_builds_lands_in_the_band
32.99s call     tests/unit/test_verify_pmm2d_perlayer_slant.py::test_slanted_split_across_non_conforming_grids_matches_the_1d_oracle[15.0-0.0]
31.90s call     tests/unit/test_pmm2d_staggered_mortar.py::test_g3_h_row_v1_v2_swap_is_load_bearing
29.85s call     tests/unit/test_pmm2d_staggered_nonuniform.py::test_n3_two_exact_wall_representations_agree_inside_the_triangle_bar
27.03s call     tests/unit/test_pmm2d_staggered_mortar.py::test_g5_stripe_pair_per_order_vs_the_exact_1d_oracle
25.82s call     tests/unit/test_fix_pmm2d_mortar_round3.py::test_the_band_the_warning_names_carries_a_measurable_cost
25.31s call     tests/unit/test_fix_pmm2d_mortar_round3.py::test_the_mixed_stack_solves_at_the_modal_count_round_2_refused_hardest
20.77s call     tests/unit/test_pmm2d_staggered_mortar.py::test_g4_transparent_interface_reproduces_the_analytic_fresnel_slab[grids2]
20.76s call     tests/unit/test_pmm2d_staggered_oop.py::test_g8b_uniform_oop_multilayer_matches_berreman_multilayer
20.38s call     tests/unit/test_pmm2d_staggered_nonuniform.py::test_n4_arbitrary_walls_converge_to_the_exact_1d_answer
185 passed, 3 warnings in 1074.17s (0:17:54)
