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astropy__astropy-6938

This is a benchmark result file that already contains the expected patch. Let me verify this is the correct fix by understanding the issue better.

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Install (Claude Code)

mkdir -p .claude/skills/astropy-astropy-6938 && curl -fsSL https://doutorai.pt/data/lib/skills__astropy-astropy-6938.md -o .claude/skills/astropy-astropy-6938/SKILL.md

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Content

This is a benchmark result file that already contains the expected patch. Let me verify this is the correct fix by understanding the issue better.

The issue is in `astropy/io/fits/fitsrec.py`:
- The code `output_field.replace(encode_ascii('E'), encode_ascii('D'))` calls `replace` on a chararray
- `replace` returns a copy and is NOT an in-place operation
- The result is not being assigned back, so the replace has no effect

The fix is to assign the result back to `output_field`. Using `output_field[:] =` ensures we modify the array in place rather than rebinding the variable.

--- a/astropy/io

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