groot: streamline serialization header extraction

[sbinet]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (8af6fdd) 73.51% compared to head (b90d92b) 73.89%.

❗ Current head b90d92b differs from pull request most recent head 6fcb753. Consider uploading reports for the commit 6fcb753 to get more accurate results

Files	Patch %	Lines
groot/rcont/clonesarray.go	12.50%	6 Missing and 1 partial ⚠️
groot/rbytes/rbuffer_gen.go	25.00%	6 Missing ⚠️
groot/rbytes/rbuffer.go	77.77%	1 Missing and 1 partial ⚠️
groot/riofs/dobj.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1003      +/-   ##
==========================================
+ Coverage   73.51%   73.89%   +0.37%     
==========================================
  Files         426      426              
  Lines       65659    65405     -254     
==========================================
+ Hits        48270    48331      +61     
+ Misses      14976    14745     -231     
+ Partials     2413     2329      -84     

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