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Expose native Gecode propagators through standard MiniZinc
fzn_hooks and additional modelling predicates ingecode.mzn.The standard hooks cover count inequalities, conditionals, nondeterministic regular constraints, optional distinctness and scheduling, and set intersection. Builtin expressions also use native extrema, supported float powers, set matrix element and scalar implication.
The Gecode-specific predicates cover distance constraints, arithmetic including array-wide and modular products, offset distinctness, matching counts, optional rectangle non-overlap, and array, channeling and set relations. Typed FlatZinc bindings document their contracts and reification support. Annotations select propagation algorithms and single or per-pair minimum-distance propagators. Fixed-base powers and inverse logarithms use explicit MPFR rounding to preserve exact solutions.
Validation: a release build, all 135 FlatZinc regressions, 131 MiniZinc integration cases, and predicate documentation generation. Focused checks also passed for shared Boolean extrema and conditional compilation and execution.