Schema attribute enum type hint does not allow null values

[acantepie]

The Schema attribute's enum property is typed as ?array<int, float|string|int>, which does not allow null values in the array.

The following syntax is correct and is the way to allow a nullable enum value :

  #[Schema(description: 'Sort by property', enum: [null, "foo", "bar"])]
  ?string $sort = null,

Current type hint (src/Capability/Attribute/Schema.php line 67-69):

/** @var ?array<int, float|string|int> */
public ?array $enum = null;

Suggested fix:

/** @var ?array<int, float|string|int|null> */
public ?array $enum = null;

Version: mcp/sdk v0.4.0

[chr-hertel]

Thanks for reporting @acantepie & thanks for the patch @bigdevlarry - looks good from my end, is it what you expected @acantepie?