Thoroughly document how your API endpoints handle data binding and processing, especially non-obvious behaviors that affect how client data is mapped to server-side structures. This includes: 1. Clearly document form tag behaviors and special syntax (like `form:"-"`) 2. Explain how different HTTP methods affect binding logic 3. Document content-type specific behaviors For example, when implementing binding in a web framework like Gin, include explanatory comments: ```go // Person represents data received from API clients type Person struct { Name string `form:"name"` Address string `form:"address"` InternalID string `form:"-"` // This field won't be populated from form data } func handleRequest(c *gin.Context) { var person Person // Document binding behavior: // If `GET`, only `Form` binding engine (`query`) used. // If `POST`, first checks the `content-type` for `JSON` or `XML`, then uses `Form` (`form-data`). if c.Bind(&person) == nil { // Process the data } } ``` Clear API behavior documentation reduces friction for API consumers, minimizes unexpected behaviors, and reduces support burden for your team.