implement configurable stack trace limit

otto.go

@@ -245,6 +245,7 @@ func New() *Otto {
 		runtime: newContext(),
 	}
 	self.runtime.otto = self
+	self.runtime.traceLimit = 10
 	self.Set("console", self.runtime.newConsole())
 
 	registry.Apply(func(entry registry.Entry) {
@@ -380,6 +381,15 @@ func (self Otto) SetStackDepthLimit(limit int) {
 	self.runtime.stackLimit = limit
 }
 
+// SetStackTraceLimit sets an upper limit to the number of stack frames that
+// otto will use when formatting an error's stack trace. By default, the limit
+// is 10. This is consistent with V8 and SpiderMonkey.
+//
+// TODO: expose via `Error.stackTraceLimit`
+func (self Otto) SetStackTraceLimit(limit int) {
+	self.runtime.traceLimit = limit
+}
+
 // MakeCustomError creates a new Error object with the given name and message,
 // returning it as a Value.
 func (self Otto) MakeCustomError(name, message string) Value {