v3.1.1: `style:deepObject` should default to `explode:true`

[charjr]

style:deepObject only has defined behaviour for explode:true:

OpenAPI-Specification/versions/3.1.0.md

Line 1088 in 42a9e3d

deepObject | true | n/a | n/a | n/a | color[R]=100&color[G]=200&color[B]=150

This would be fine, but it defaults to explode:false.

I don't believe any style should default to undefined behaviour. I believe this style should default to explode:true, just as form does:

OpenAPI-Specification/versions/3.1.0.md

Line 1035 in 42a9e3d

<a name="parameterExplode"></a>explode | `boolean` | When this is true, parameter values of type `array` or `object` generate separate parameters for each value of the array or key-value pair of the map. For other types of parameters this property has no effect. When [`style`](#parameterStyle) is `form`, the default value is `true`. For all other styles, the default value is `false`.

[handrews]

@charjr yes, we're aware, and you're correct. It was always an error in the spec. Unfortunately we cannot change the behavior in a minor release. This will get addressed as part of larger clean-up efforts with 4.0, and is already tracked for that project so I'm going to close this issue here as redundant.

[handrews]

On second thought, I think I have a solution: Since style: deepObject, explode: false has no defined behavior in 3.1, we can just define it to have the same behavior as style: deepObject, explode: true in 3.2. We can't change the default, but we can (in a slightly weird and aesthetically unpleaseing way) make the default make sense.

@charjr thanks for filing this- I would never have thought to revisit the problem in 3.2 otherwise!