Considering potential ambiguity, I suggest `d1.append(d2)` so we can have an
additional argument saying `d1.append(d2, mode="some mode that tells how this
function behaviours")`.
If we are really to have the new syntax `d1 + d2`, I suggest leaving it for
`d1.append(d2, mode="strict")` which raises an error when there're duplicate
keys. The semantics is nature and clear when two dicts have no overlapping keys.
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