JSON-LD onsite examples: are @context values missing a trailing slash?

I noticed that the @context value in the JSON-LD examples on schema.org's
site are noted as:

"@context": "http://schema.org",

Where "http://schema.org" doesn't contain a trailing slash.

Yet when I look at the official specs (http://www.w3.org/TR/json-ld/) I see
all values do contain a trailing slash, eg:

"@context": {
    "@vocab": "http://schema.org/"
}

Now to me it seems that urls without a trailing slash would resolve in urls
like for example schema.orgArticle as opposed to schema.org/Article, which
makes me wonder whether or not the slash matters for the @context.

Any thoughts?