{{{foo}}} when foo is a plain JS object should return JSON

[arekinath]

While it's not made clear in the spec, it seems most other implementations of mustache (and certainly the original Ruby one) spit out a nested object/hash/dict as some parseable form for their host language.

Example:

require 'mustache'
Mustache.render("hi {{{foo}}}", {:foo => {:bar => 123, :test => "abc"}})
# => "hi {:bar=>123, :test=>\"abc\"}"

Currently in this case on Hogan.js, we just spit out [object Object], which is not very useful:

var Hogan = require('hogan.js');
var tpl = Hogan.compile('hi {{{foo}}}');
tpl.render({foo: {bar: 123, test: 'abc'}})
// => "hi [object Object]"

This patch amends coerceToString to return JSON when we're asked to output a nested plain JS object (ie, one without its own toString implementation), so the output for the case above changes to "hi {\"bar\": 123, \"test\": \"abc\"}"

[Badestrand]

Why is this not merged yet? The errors for the checks are all for the npm install and not for that two lines of trivial code.
edit: I stand corrected. Nonetheless it would be great if the fixed code could be merged some time soon.

[ex1st]

Need check for null.

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