[Correctness] IJsonServiceSerializer vs IXmlServiceSerializer — Nullable parameter asymmetry

[Christophe-Rogiers]

Severity: Warning

Files:

• src/Servy.Core/Services/IJsonServiceSerializer.cs line 17
• src/Servy.Core/Services/IXmlServiceSerializer.cs line 17

Description:
The two symmetric serializer interfaces are inconsistent: XML Deserialize accepts string? (null-safe), JSON Deserialize requires non-null string. A null JSON string will bypass the null contract at compile time and likely throw at runtime. Both should be string? since both can legitimately receive null.

Suggested fix:
Change IJsonServiceSerializer.Deserialize(string json) to Deserialize(string? json).

[aelassas]

All fixed.