fix(decoder): corrupt result when a decoder decodes multiple values

[dxbjavid]

What type of PR is this?

fix

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(Optional) More detailed description for this PR(en: English/zh: Chinese).

en: when a single decoder reads more than one value from the same buffer, the second and later calls begin parsing at a non-zero offset. the opt decoder keeps the whole input in its Json field but only copies data[pos:] into the padded scan buffer, so every node offset ends up shifted by pos and strings or numbers come back from the wrong place; once pos grows past the padding it also reads a little beyond the copied buffer. the utf8-correcting branch just above already stores data[pos:], so this lines the other branch up with it. i have added a regression test that decodes two values from one decoder.

zh(optional):

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.24%. Comparing base (59be92f) to head (635c100).
⚠️ Report is 83 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #954      +/-   ##
==========================================
- Coverage   51.86%   51.24%   -0.63%     
==========================================
  Files         127      170      +43     
  Lines       10893    14145    +3252     
==========================================
+ Hits         5650     7248    +1598     
- Misses       4920     6505    +1585     
- Partials      323      392      +69     

Flag	Coverage Δ
arm	42.88% <100.00%> (?)
macos-latest	44.05% <100.00%> (?)
ubuntu-24.04-arm	42.88% <100.00%> (?)
ubuntu-latest	49.70% <100.00%> (?)
x86	49.70% <100.00%> (?)

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[dxbjavid]

Hi maintainers,

Just a friendly follow-up on this PR. When you have a chance, could you please provide an update on its review status?

Happy to make any additional changes if needed.

Thank you!