Note Get* behavior on parse failure

Even though it's kind of evident as these functions don't return an error, it can still come as a surprise.
spf13 · Nov 30, 2023 · 4c9b2a2 · 4c9b2a2
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diff --git a/README.md b/README.md
@@ -565,6 +565,9 @@ One important thing to recognize is that each Get function will return a zero
 value if it’s not found. To check if a given key exists, the `IsSet()` method
 has been provided.
 
+The zero value will also be returned if the value is set, but fails to parse
+as the requested type.
+
 Example:
 ```go
 viper.GetString("logfile") // case-insensitive Setting & Getting