fix: correct gcmask value in documentation

[saschabuehrle]

Bug

Fixes #66 — The gcmask value in the documentation example was incorrect.

Fix

Changed to for the Object struct's gcmask.

Analysis

Given the Object structure:

type Object struct {
    A string    // 16 bytes (2 words) - pointer to data + length
    B int64     // 8 bytes (1 word) - not a pointer  
    C *[]byte   // 8 bytes (1 word) - pointer
}

The gcmask indicates which 8-byte aligned addresses contain pointers:

• base+0: A string (contains pointer to string data) - bit 1
• base+8: A string length (not a pointer) - bit 0
• base+16: B int64 (not a pointer) - bit 0
• base+24: C *[]byte (pointer) - bit 1

Therefore, the correct gcmask is 1001 (reading bits from left to right for base+0, base+8, base+16, base+24).

Testing

Verified by analyzing the memory layout and pointer positions in the Object struct.

Greetings, saschabuehrle

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.84%. Comparing base (65e6157) to head (6508e4d).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #69       +/-   ##
==========================================
+ Coverage   2.70%   60.84%   +58.14%     
==========================================
  Files         15       16        +1     
  Lines       2221     2222        +1     
==========================================
+ Hits          60     1352     +1292     
+ Misses      2155      716     -1439     
- Partials       6      154      +148     

Flag	Coverage Δ
unit	60.84% <ø> (+58.14%)	⬆️

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[pawamoy]

Sorry to interrupt, I wanted to let you know that this PR is most probably entirely AI-generated, including replies to your comments. Just see the batch of PRs they opened recently to form your own opinion. I doubt they'll sign the CLA.