fix: inconsistencies when analyzing unnamed closures

[EagleoutIce]

Furthermore, this

• improves mermaid's printing of expression lists when the lexeme is unknown.
• simplifies the flag for named and unnamed function calls as a boolean

[codecov]

Codecov Report

Attention: Patch coverage is 77.55102% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 71.69%. Comparing base (43a4ef5) to head (dfa43d0).

Files	Patch %	Lines
src/util/mermaid/dfg.ts	60.00%	0 Missing and 4 partials ⚠️
src/util/mermaid/ast.ts	33.33%	2 Missing ⚠️
...ess/functions/call/built-in/built-in-assignment.ts	50.00%	0 Missing and 1 partial ⚠️
src/reconstruct/reconstruct.ts	85.71%	0 Missing and 1 partial ⚠️
src/slicing/criterion/filters/all-variables.ts	0.00%	0 Missing and 1 partial ⚠️
...c/statistics/features/common-syntax-probability.ts	0.00%	0 Missing and 1 partial ⚠️
...s/supported/defined-functions/defined-functions.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #823      +/-   ##
==========================================
- Coverage   71.76%   71.69%   -0.07%     
==========================================
  Files         201      201              
  Lines        7239     7243       +4     
  Branches     1221     1122      -99     
==========================================
- Hits         5195     5193       -2     
- Misses       1689     1693       +4     
- Partials      355      357       +2     

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[EagleoutIce]

This pull request is included in v2.0.2 (see Release v2.0.2 (Fixing Control-Flow, Markdown-Exports, and Handling of Unnamed Closures)).