Access scientific extension on item using .ext

[jsignell]

Related Issue(s):

closes #1485

Description:

It was indeed very straightforward

PR Checklist:

• Pre-commit hooks and tests pass (run scripts/test)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.23%. Comparing base (1cf7f3f) to head (cf1e8ed).
Report is 34 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1496   +/-   ##
=======================================
  Coverage   91.23%   91.23%           
=======================================
  Files          53       53           
  Lines        7335     7338    +3     
  Branches      894      894           
=======================================
+ Hits         6692     6695    +3     
  Misses        457      457           
  Partials      186      186           

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