Revert "Use sync.Map for http.mux.wildcards (#3417)"

This reverts commit ab8c54d.

http/mux.go

@@ -77,15 +77,15 @@ type (
 		middlewares []func(http.Handler) http.Handler
 		// wildcards maps a method and a pattern to the name of the wildcard
 		// this is needed because chi does not expose the name of the wildcard
-		wildcards sync.Map
+		wildcards map[string]string
 	}
 )
 
 // NewMuxer returns a Muxer implementation based on a Chi router.
 func NewMuxer() ResolverMuxer {
 	return &mux{
 		Router:      chi.NewRouter(),
-		wildcards:   sync.Map{},
+		wildcards:   make(map[string]string),
 		middlewares: []func(http.Handler) http.Handler{},
 	}
 }
@@ -114,7 +114,7 @@ func (m *mux) Handle(method, pattern string, handler http.HandlerFunc) {
 			panic("too many wildcards")
 		}
 		pattern = wildPath.ReplaceAllString(pattern, "/*")
-		m.wildcards.Store(method+"::"+pattern, wildcards[1])
+		m.wildcards[method+"::"+pattern] = wildcards[1]
 	}
 	m.Method(method, pattern, handler)
 }
@@ -132,9 +132,8 @@ func (m *mux) Vars(r *http.Request) map[string]string {
 	vars := make(map[string]string, len(params.Keys))
 	for i, k := range params.Keys {
 		if k == "*" {
-			if wildcard, ok := m.wildcards.Load(r.Method + "::" + ctx.RoutePattern()); ok {
-				vars[wildcard.(string)] = unescape(params.Values[i])
-			}
+			wildcard := m.wildcards[r.Method+"::"+ctx.RoutePattern()]
+			vars[wildcard] = unescape(params.Values[i])
 			continue
 		}
 		vars[k] = unescape(params.Values[i])
@@ -175,8 +174,8 @@ func (m *mux) ResolvePattern(r *http.Request) string {
 // resolveWildcard returns the route pattern with the wildcard replaced by the
 // name of the wildcard.
 func (m *mux) resolveWildcard(method, pattern string) string {
-	if wildcard, ok := m.wildcards.Load(method + "::" + pattern); ok {
-		return pattern[:len(pattern)-2] + "/{*" + wildcard.(string) + "}"
+	if wildcard, ok := m.wildcards[method+"::"+pattern]; ok {
+		return pattern[:len(pattern)-2] + "/{*" + wildcard + "}"
 	}
 	return pattern
 }