1. A computer-implemented method for sharing property descriptor information, comprising: modifying an object data structure in a dynamic programming environment to change an initial number of object properties provided by the object data structure; generating, in response to modifying the object data structure, a child object map for the modified object data structure, the child object map being a child map of a parent object map for the unmodified object data structure; sharing a descriptor array associated with the parent object map with the child object map in connection with generating the child object map; altering the descriptor array according to the modified object data structure; and limiting access to the descriptor array from the parent object map in accordance with the initial number of object properties of the unmodified object data structure.