Changes

where <i>string</i> is the requested portion of the string the actor represents. Values for <i>start</i> less than zero are treated as zero; values greater than the length of the string are treated as the length of the string. Values for <i>end</i> are treated similarly. If <i>end</i> is less than <i>start</i>, the two values are swapped. (This is meant to be the same behavior as JavaScript's <code>String.prototype.substrsubstring</code>.)

Like As with any other actor, the client may only send messages to a long string grip actor while it is alive: for [[#Grip_Lifetimes|pause-lifetime grips]], until the debuggee is resumed; or for [[#Grip_Lifetimes|thread-lifetime grips]], until the thread is detached from or exits. However, unlike object grip actors, the client may communicate with a long string grip actors must only receive messages from actor at any time the client while actor is alive, regardless of whether the thread debuggee is paused. (Since strings are immutable values in JavaScript, the responses from a long string grip actor cannot depend on the actions of the <b>Paused</b> statedebuggee.)

However, in some cases the client may wish to retain a reference to an object or long string while the debuggee runs. For example, a panel displaying objects selected by the user must update its view of the objects each time the debuggee pauses. To carry this out, the client can promote a pause-lifetime grip to a <b>thread-lifetime</b> grip, which lasts until the thread is detached from or exits. Actors in thread-lifetime grips are children of the thread actor. When the client no longer needs a thread-lifetime grip, it can explicitly release it.

Regardless of the lifetime of a grip, the client may only send messages to object grip actors while the thread to which they belong is paused; the client's interaction with mutable values cannot take place concurrently with the thread.