implement some suggestions by refurb

[mr-c]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 34.63%. Comparing base (02d6dbd) to head (95be2a5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cwl_utils/sandboxjs.py	44.44%	4 Missing and 1 partial ⚠️
cwl_utils/utils.py	55.55%	4 Missing ⚠️
cwl_utils/parser/cwl_v1_0_utils.py	66.66%	3 Missing ⚠️
cwl_utils/parser/cwl_v1_1_utils.py	62.50%	3 Missing ⚠️
cwl_utils/parser/cwl_v1_2_utils.py	72.72%	3 Missing ⚠️
cwl_utils/cwl_v1_0_expression_refactor.py	66.66%	1 Missing ⚠️
cwl_utils/cwl_v1_1_expression_refactor.py	66.66%	1 Missing ⚠️
cwl_utils/cwl_v1_2_expression_refactor.py	66.66%	1 Missing ⚠️
cwl_utils/expression.py	66.66%	1 Missing ⚠️
cwl_utils/image_puller.py	80.00%	0 Missing and 1 partial ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #381      +/-   ##
==========================================
+ Coverage   34.62%   34.63%   +0.01%     
==========================================
  Files          30       30              
  Lines       35417    35396      -21     
  Branches     9538     9538              
==========================================
- Hits        12262    12259       -3     
+ Misses      20275    20257      -18     
  Partials     2880     2880              

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