Order Space by insertion order

[NeilGirdhar]

Now that dictionaries are ordered by insertion order, sorting lexicographically is not necessary to ensure consistency.

Fixes #1103

Tests

• [ ] I added corresponding tests for bug fixes and new features. If possible, the tests fail without the changes
• [x] All new and existing tests are passing ($ tox -e py38; replace 38 by your Python version if necessary)

Documentation

• [ ] I have updated the relevant documentation related to my changes

Quality

• [x] I have read the CONTRIBUTING doc
• [x] My commits messages follow this format
• [x] My code follows the style guidelines ($ tox -e lint)