copies: extract value comparison in the python copy tracing
This mirror what we did in the Rust code. This is useful to prepare rework for
this comparison logic that we will need to handle more advanced chaining cases
(when merges are chained).
Differential Revision: https://phab.mercurial-scm.org/D9590
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2