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updating a table captures too many keys

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
68/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
python
Domain
data

Research direction

Start by running the Python reproduction in the issue and inspect how assigning a mapping to doc["a"]["b"] affects table structure and serialization. Trace the relevant table-update and dump paths; done means tomlkit emits [a.b] with x = 9 while a.c and a.d remain sibling tables, with regression coverage for this case.

Written by the indexing model from the issue text.

Description

#!/usr/bin/env python3

import tomlkit

doc = tomlkit.loads("a.b = 1\na.c = 2\na.d = 3\n")
doc["a"]["b"] = {"x": 9}

output = tomlkit.dumps(doc)

print(output)

result

[a.b]
x = 9
a.c = 2
a.d = 3

in which a.c and a.d have become children of the [a.b] table

similar to #542, #543, but not fixed by PRs currently open for those so should be distinct.

Dominant language
Python
Stars
850
Forks
163
Avg merge
13m
Merged PRs (30d)
2

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  4. Open a pull request that references the issue number.

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