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+## The = here is literal. To assign by index, use ( [index]=value ) with no spaces. To keep as literal, quote it.
+
+### Problematic code:
+
+```sh
+array=( [index] = value )
+```
+
+### Correct code:
+
+```sh
+array=( [index]=value )
+```
+
+### Rationale:
+
+The shell doesn't care about the `=` sign in your array assignment because it's not part of a recognized index assignment. Instead, it's considered a literal character and becomes part of an array element's value.
+
+In the example problematic code, this is because the `=` was intended to set the index, but the shell will not recognize it when it is surrounded by spaces.
+
+Make sure to remove any spaces around the `=` when assigning by index, such as in the correct code.
+
+If you wanted the `=` to be a literal part of the array element, add quotes around it, such as `env=( "LC_CTYPE=C" )` or `specialChars=( "=" "%" ";" )` .
+
+### Exceptions:
+
+None. 
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