[Narek-Khachikyan]

Anchored null values currently fail to decode into pointer fields with "null was used where mapping is expected". Preserve the pointer type when allocating the destination for an anchored null, so null handling can leave it nil and aliases reuse that value.

Fixes #750.

Local proof: the regression failed before the fix and passes for null and ~, with nil and initialized pointers. go test -race ./..., validator integration tests, go vet ./..., and make lint pass.

CI limitation: the macOS race job aborts before the root package tests start with missing LC_UUID load command. The same loader failure appears in an earlier unrelated run. Matrix fail-fast cancels other race jobs.

• Describe the purpose for which you created this PR.
• Create test code that corresponds to the modification

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.66%. Comparing base (edee2f9) to head (a474c62).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #990   +/-   ##
=======================================
  Coverage   80.65%   80.66%           
=======================================
  Files          22       22           
  Lines        6845     6848    +3     
=======================================
+ Hits         5521     5524    +3     
  Misses        905      905           
  Partials      419      419           

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