Improve store performance

**Problem**
When working with types, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

No files or tests are named in the issue. Start by locating the store and type-handling entry points, then inspect the existing error paths and performance behavior; done should mean the relevant errors include useful debugging context and the store performance concern has a measurable improvement.

Written by the indexing model from the issue text.