Fix : MapAdapter to serialize Long keys as integer instead of string

[gowoonsori]

Hi, thanks for this great library! I've been using it in my project and it works really well.

I found a small issue with MapAdapter and wanted to contribute a fix.

Problem

When a Map has Long type keys, MapAdapter falls through to the else
branch and calls key.toString(), resulting in the key being serialized as a
PHP string (s:) instead of an integer (i:).

For example, a map with key 1L would produce:

• Before: a:1:{s:1:"1";s:5:"value";}
• After: a:1:{i:1;s:5:"value";}

Changes

• Added Long instanceof check in MapAdapter to write integer keys via
  writer.writeKey((long) key)
• Added writeKey(long) overload in Writer to support long type keys
• Added test case for Long keys in MapAdapterTest

Notes

This is consistent with the existing writeInteger(Long) method in Writer,
which already serializes Long values using the i: format.

[marcospassos]

Hi @gowoonsori, this project is no longer actively maintained, and I don't have the time to keep it updated. I'd recommend forking it and maintaining your own version.