Description:
------------
Strings matching pattern [0-9]+\. are emitted without quotes, which according to YAML 1.2 spec http://yaml.org/spec/1.2/spec.html#id2805071 are floats. They should be quoted as strings.

I could not find a clear answer from YAML 1.1 spec (what the extensions claims to support) what is the expected behavior there.

Test script:
---------------
echo yaml_emit( [ 'a' => '1.0', 'b' => '2.', 'c' => '3'] );

Expected result:
----------------
---
a: "1.0"
b: "2."
c: "3"
...

Actual result:
--------------
---
a: "1.0"
b: 2.
c: "3"
...