Stack Overflow When Parsing Recursive Structs with Structured Outputs

[williamfzc]

Hi team,

I've been experimenting with the structured outputs example and successfully implemented response formatting based on the provided code.

While the example works well for flat or non-recursive structures, I'm encountering a stack overflow when attempting to parse recursive structs. For instance, consider the following type definition:

type HistoricalComputer struct {
	Origin       Origin               `json:"origin" jsonschema_description:"The origin of the computer"`
	Name         string               `json:"full_name" jsonschema_description:"The name of the device model"`
	Legacy       string               `json:"legacy" jsonschema:"enum=positive,enum=neutral,enum=negative" jsonschema_description:"Its influence on the field of computing"`
	
	// Recursive reference
	NotableFacts []HistoricalComputer `json:"notable_facts" jsonschema_description:"A few key facts about the computer"`
}

When this type is used in a request involving structured output, the program crashes due to infinite recursion during schema generation or JSON parsing, resulting in a stack overflow.