Remove unused converters

Sources/Confidence/ConfidenceValue.swift

@@ -168,78 +168,6 @@ private enum ConfidenceValueInternal: Equatable, Encodable {
     case list([ConfidenceValueInternal])
     case structure([String: ConfidenceValueInternal])
     case null
-
-    public func asBoolean() -> Bool? {
-        if case let .boolean(bool) = self {
-            return bool
-        }
-
-        return nil
-    }
-
-    public func asString() -> String? {
-        if case let .string(string) = self {
-            return string
-        }
-
-        return nil
-    }
-
-    public func asInteger() -> Int64? {
-        if case let .integer(int64) = self {
-            return int64
-        }
-
-        return nil
-    }
-
-    public func asDouble() -> Double? {
-        if case let .double(double) = self {
-            return double
-        }
-
-        return nil
-    }
-
-    public func asDateComponents() -> DateComponents? {
-        if case let .date(dateComponents) = self {
-            return dateComponents
-        }
-
-        return nil
-    }
-
-    public func asDate() -> Date? {
-        if case let .timestamp(date) = self {
-            return date
-        }
-
-        return nil
-    }
-
-    public func asList() -> [ConfidenceValueInternal]? {
-        if case let .list(values) = self {
-            return values
-        }
-
-        return nil
-    }
-
-    public func asStructure() -> [String: ConfidenceValueInternal]? {
-        if case let .structure(values) = self {
-            return values
-        }
-
-        return nil
-    }
-
-    public func isNull() -> Bool {
-        if case .null = self {
-            return true
-        }
-
-        return false
-    }
 }
 
 extension ConfidenceValueInternal: CustomStringConvertible {