axs.format() resets per-axis axesedgecolor set via ax.format()

[munechika-koyo]

Summary

When setting axesedgecolor per-axis with ax.format(...), calling axs.format(...) afterward (even only for title) appears to reset the edge colors.

Minimal Reproducible Example

import ultraplot as uplt

fig, axs = uplt.subplots(ncols=2)
for i, ax in enumerate(axs):
 ax.format(
 axesedgecolor=f"C{i}",
 title="Axes edge color",
 )

This applies different edge colors to each axes as expected.

import ultraplot as uplt

fig, axs = uplt.subplots(ncols=2)
for i, ax in enumerate(axs):
 ax.format(
 axesedgecolor=f"C{i}",
 )

axs.format(
 title="Axes edge color",
)

In this case, after axs.format(...), the per-axis edge colors are reset.

Expected behavior

Calling axs.format(...) for unrelated properties (e.g., title) should not overwrite/reset per-axis axesedgecolor values already set with ax.format(...).

Actual behavior

Per-axis axesedgecolor appears to be reset after axs.format(...).

Additional context

If this is intended behavior, it would be helpful to document it clearly. Otherwise, this may be a bug/regression in property merging/precedence between Axes.format and AxesGroup.format.