[OpenLayers-Users] specifying options for OL class properties--when to use quotes?

[Mike Quentel]

In some of the examples, when adding a Layer, I see some properties
(options) have quotes (single or double).  What is the general rule for
using quotes on the properties?  

Is this correct: 

{buffer: 2, gutter: 15, sphericalMercator: true, attribution: "some
label"}

or should it be this:

{'buffer': 2, 'gutter': 15, 'sphericalMercator': true, 'attribution':
"some label"}

Thanks.

Mike Quentel

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