I'm combining Tobie's and mine Hash patches to see how they work out. These
changes fix 3 bugs and remove some premature optimization from toQueryString
method. Now, ticket #7494 by Skirch is about nested hash support - I like it
and am thinking about rolling it in for the next release. There are a number
of questions regarding all these changes, though. I'd like to sort out the
inconsistencies.

   1. undefined (or null) values are currently serialized as empty
   strings - should those key/value pairs be skipped instead?
   2. undefined (or null) values are currently skipped if they're inside
   an array value - should it be consistent with #1?
   3. should array values be flattened when serializing? (#7494 does
   this)
   4. should we support nested hashes?

Same questions expressed in JS code:

   1. { foo:null } => "foo="
   2. { foo:['a', null, 'b']} => "foo=a&foo=b"; { foo:[null] } => "foo="
   3. { foo:['a', ['b'], 'c']} => "foo=a&foo=[object]&foo=c"
   4. { foo:{bar:'baz'}} => "foo[bar]=baz"

Remeber, the toQueryString is all about sending that data to the server. The
result strings are also used inside Prototype to check if the form has been
modified.

Please, state your opinions.

--
http://dev.rubyonrails.org/ticket/7494

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