Fix segfault in format_default_value due to unexpected enum/object

Evaluating constants at comptime can result in arrays that contain objects. This
is problematic for printing the defaul

Fix segfault in format_default_value due to unexpected enum/object

Evaluating constants at comptime can result in arrays that contain objects. This
is problematic for printing the default value of constant ASTs containing
objects, because we don't actually know what the constructor arguments were.
Avoid this by not propagating array constants.

Fixes GH-11937
Closes GH-11947

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