Autocompletion triggers error in invalid `AbstractDict`

[jakobnissen]

So, this may or may not be intended behaviour.
I'm writing a package with a new AbstractDict type, which is lazily validated. That means its possible to construct an invalid instance (which may be checked with isvalid). Encountering an invalid value when iterating the dict, or accessing an invalid key will throw an exception.
Problem is, the REPL will access the dictionary while giving autocomplete suggestions (see below)

Is this a problem? Maybe it's fair to assume iterating an AbstractDict never errors.

julia> aux["K┌ Error: Error in the keymap
│   exception =
│    Bad AuxTag
│    Stacktrace:
│      [1] error(s::String)
│        @ Base ./error.jl:44
│      [2] (::XAMAuxData.var"#5#6")(val::XAMAuxData.Errors.Error)
│        @ XAMAuxData ~/code/XAMAuxData.jl/src/XAMAuxData.jl:213
│      [3] iterate
│        @ ./generator.jl:48 [inlined]
│      [4] find_dict_matches(identifier::XAMAuxData.BAM.Auxiliary{MemViews.ImmutableMemView{UInt8}}, partial_key::String)
│        @ REPL.REPLCompletions ~/code/julia/usr/share/julia/stdlib/v1.12/REPL/src/REPLCompletions.jl:1000
│      [5] completions(string::String, pos::Int64, context_module::Module, shift::Bool, hint::Bool)
│        @ REPL.REPLCompletions ~/code/julia/usr/share/julia/stdlib/v1.12/REPL/src/REPLCompletions.jl:1249
│      [6] complete_line(c::REPL.REPLCompletionProvider, s::REPL.LineEdit.PromptState, mod::Module; hint::Bool)
│        @ REPL ~/code/julia/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:659
│      [7] check_for_hint(s::REPL.LineEdit.MIState)
│        @ REPL.LineEdit ~/code/julia/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:384
│      [8] (::REPL.LineEdit.var"#143#199")(s::REPL.LineEdit.MIState, data::Any, c::Union{Char, SubString{String}, String})
│        @ REPL.LineEdit ~/code/julia/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2520
│      [9] #invokelatest#2
│        @ ./essentials.jl:1045 [inlined]
│     [10] invokelatest
│        @ ./essentials.jl:1042 [inlined]
│     [11] (::REPL.LineEdit.var"#30#31"{REPL.LineEdit.var"#143#199", String})(s::Any, p::Any)
│        @ REPL.LineEdit ~/code/julia/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:1704
│     [12] macro expansion
│        @ ~/code/julia/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2854 [inlined]
│     [13] macro expansion
│        @ ./lock.jl:273 [inlined]
│     [14] (::REPL.LineEdit.var"#282#284"{REPL.Terminals.TTYTerminal, REPL.LineEdit.ModalInterface, REPL.LineEdit.MIState, ReentrantLock, REPL.LineEdit.Prompt})()
│        @ REPL.LineEdit ~/code/julia/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2844
└ @ REPL.LineEdit ~/code/julia/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:2856