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Add readability note about shadowing in ch03-01 #4726

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Add readability note about shadowing in ch03-01 #4726

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3 changes: 3 additions & 0 deletions src/ch03-01-variables-and-mutability.md
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Expand Up @@ -183,6 +183,9 @@ The error says we’re not allowed to mutate a variable’s type:
{{#include ../listings/ch03-common-programming-concepts/no-listing-05-mut-cant-change-types/output.txt}}
```

> Note: Shadowing is often most useful for short, local transformations.
> Overusing it across larger or nested scopes can make code harder to read.

Now that we’ve explored how variables work, let’s look at more data types they
can have.

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