By default, werkzeug doesn't preserve the order
of the parameters sent to routes.
As stated in the werkzeug documentation:
```
parameter_storage_class
the class to use for args and form.
The default is an ImmutableMultiDict which supports multiple values per key.
alternatively it makes sense to use an ImmutableOrderedMultiDict
which preserves order or a ImmutableDict which is the fastest
but only remembers the last key.
It is also possible to use mutable structures, but this is not recommended.
New in version 0.6.
```
For some of our use cases, it makes sense to keep the order
of the route parameters.
e.g. In the website builder, when building a form
with a bunch of inputs values that will be concatened
in a lead note, the user expects the answer to be displayed
in the same order than the form inputs.
This change is seen as a bit risky as it could lead to
performances issues in the http routes processing, and this
is the reason we do not merge this in stable 9.0 at the moment.
If needed, it could be back ported later to 9.0, after
several weeks/months of testing in this release(saas-10 atm).
opw-677508
Denis Ledoux
bc2a06c019