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engine: MDL writer silently drops Equation::Arrayed default_equation (EXCEPT), losing equations for default-only elements

Status: Open.

#858 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

engine: MDL writer ignores compat on stocks and arrayed vars, silently dropping ACTIVE INITIAL / GET DIRECT

Status: Open.

#857 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

engine: MDL export has no lossiness contract -- callers can't learn an export was degraded

Status: Open.

#856 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

cli: convert -o output write is non-atomic and panics on IO errors

Status: Open.

#855 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

engine: MDL writer silently drops GraphicalFunction.kind (extrapolate/discrete lookups exported as plain continuous)

Status: Open.

#854 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

engine: MDL writer silently rebinds user variables named like Vensim control/builtin keywords (Time Step, Time, PI, ...)

Status: Open.

#853 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

engine: MDL writer exports 1-arg INITIAL as invalid ACTIVE INITIAL -- name-only inverse of many-to-one function renames (roundtrip harness is blind to the class)

Status: Open.

#852 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

engine: MDL roundtrip harness coverage gaps let confirmed writer bugs ship undetected

Status: Open.

#851 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

engine: MDL writer emits zero-arg builtin calls like PI() that the MDL parser rejects (Vensim has no PI builtin)

Status: Open.

#850 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

engine: MDL writer emits doc/units/group free-text unsanitized, silently corrupting exported models

Status: Open.

#849 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

engine: MDL writer round-trip is not idempotent (time_units gain, TIME BASE rewrite, NaN emission, wrong sim_specs model)

Status: Open.

#848 In bpowers/simlin;

· bpowers opened on Jul 7, 2026

engine: MDL writer prints wildcard subscripts as '*' instead of 'Dim!' -- exported .mdl fails re-parse

Status: Open.

#847 In bpowers/simlin;

· bpowers opened on Jul 7, 2026