3 errors

Type "Awaitable[Set[Unknown]] | Set[Unknown]" is not assignable to return type "Set[str]"   Type "Awaitable[Set[Unknown]] | Set[Unknown]" is not assignable to type "Set[str]"     "Awaitable[Set[Unknown]]" is not assignable to "Set[str]" (reportReturnType)

Argument of type "Awaitable[Set[Unknown]] | Set[Unknown]" cannot be assigned to parameter "obj" of type "Sized" in function "len"   Type "Awaitable[Set[Unknown]] | Set[Unknown]" is not assignable to type "Sized"     "Awaitable[Set[Unknown]]" is incompatible with protocol "Sized"       "__len__" is not present (reportArgumentType)

"Langfuse" is not exported from module "langfuse"   Import from "langfuse._client.client" instead (reportPrivateImportUsage)

Operation on "__all__" is not supported, so exported symbol list may be incorrect (reportUnsupportedDunderAll)