The result of a linking and layout compatibility check. Here is what the different combinations
mean:
{ struct: true, struct_layout: true }: fully backward compatible
{ struct_and_function_linking: true, struct_layout: false }: Dependent modules that reference functions or types in this module may not link. However, fixing, recompiling, and redeploying all dependent modules will work–no data migration needed.
{ type_and_function_linking: true, struct_layout: false }: Attempting to read structs published by this module will now fail at runtime. However, dependent modules will continue to link. Requires data migration, but no changes to dependent modules.
{ type_and_function_linking: false, struct_layout: false }: Everything is broken. Need both a data migration and changes to dependent modules.