The following symbols are exported by the seed library but are marked as private. Anyhow, libpeas would make good use of them or a similar feature.

This symbol handling GValues looks clean and is already used by libpeas 0.7 (shame!)

gboolean seed_gvalue_from_seed_value (SeedContext    ctx,
                                      SeedValue      val,
                                      GType          type,
                                      GValue        *gval,
                                      SeedException *exception);


The following ones have a more "private" look so we didn't use them yet despite we have a patch doing so: GIArgument <-> JSValue

gboolean seed_gi_make_argument       (SeedContext    ctx,
                                      SeedValue      value,
                                      GITypeInfo    *type_info,
                                      GIArgument    *arg,
                                      SeedException *exception);
SeedValue seed_gi_argument_make_js   (SeedContext    ctx,
                                      GIArgument    *arg,
                                      GITypeInfo    *type_info,
                                      SeedException *exception);


Maybe they should get exported publicly with a name such as seed_gi_argument_from_seed_value() and seed_gi_argument_to_seed_value() or something ?