fix: Djot user-defined pseudo-symbols nesting issue #141
+77
−4
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The issue as found via the resilient manual revamping Omikhleia/resilient.sile#122
(whatever unicode symbol is U+xxxx)
We are modifying by side effect the options, and an error occurs on the second occurrence.
I don't like shallow copying lists for no obvious reasons, but there seems to be other cases that could be affected too, and I lack time for investigating them...