Upgrade/downgrade quotes in Textmate

Question

Let's say I have this text:

"stringy thingy"

Is there a Textmate command or bundle that lets me place my cursor inside the quotes, press a command key sequence, and it will automatically change this pair of quotes back and forth between

"stringy thingy"
'stringy thingy'

Bonus points if there's a command or bundle that also works the same but between braces, parenthesis, and/or curly braces.

Answer 1

In the source bundle, you have the Toggle Single / Double String Quotes command, it's mapped to ^".