1. A method comprising: executing code of a first type in a multitenant environment, the code having a plurality of reference types, wherein the multitenant environment includes data for multiple client entities, each identified by a tenant identifier (ID) having one of one or more users associated with the tenant ID, users of each of multiple client identities can only access data identified by a tenant ID associated with the respective client entity, and the multitenant environment is at least a hosted database provided by an entity separate from the client entities, and provides on-demand database service to the client entities; identifying a value type reference from the plurality of reference types; unboxing the value type; performing an operation associated with the value type to generate a result; boxing the result; and generating code of a second type comprising at least the boxed result.