Move toEntry to be a method so that it can be override, if necessary

[dpvc]

This PR moves the toEntry() call to a method so that it can be overridden if subclassed (I need the in one of the examples in the demos-node update).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.70%. Comparing base (4d1e195) to head (0f7dd5d).
Report is 45 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1307      +/-   ##
===========================================
- Coverage    86.71%   86.70%   -0.02%     
===========================================
  Files          337      337              
  Lines        83979    84021      +42     
  Branches      4750     4752       +2     
===========================================
+ Hits         72826    72853      +27     
- Misses       11130    11168      +38     
+ Partials        23        0      -23     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[zorkow]

Could you then also remove the function in line 29/30? Or is that the one you need to have in the demos?

[dpvc]

It could be removed if the definition is moved to the toEntry() method instead. But it seemed like a potentially useful function, so I left it exported. But I suppose it could be moved to ts/util/string.ts instead. I'll make another commit to do that.