diff --git a/Sources/MultipartFormData/Boundary.swift b/Sources/MultipartFormData/Boundary.swift
index 251178f..ae9bc00 100644
--- a/Sources/MultipartFormData/Boundary.swift
+++ b/Sources/MultipartFormData/Boundary.swift
@@ -92,18 +92,19 @@ extension Boundary {
     }
 }
 
-// MARK: - Debug
+// MARK: - CustomDebugStringConvertible
 
 extension Boundary: CustomDebugStringConvertible {
     public var debugDescription: String {
-        return _value
+        return rawValue
     }
 }
 
-// MARK: - Helpers
+// MARK: - Data
 
 extension Boundary {
-    internal var _value: String {
+    /// The raw string representation of a boundary.
+    public var rawValue: String {
         return String(bytes: _asciiData, encoding: .ascii) ?? ""
     }
 }
diff --git a/Sources/MultipartFormData/ContentType.swift b/Sources/MultipartFormData/ContentType.swift
index 649f116..ab218ee 100644
--- a/Sources/MultipartFormData/ContentType.swift
+++ b/Sources/MultipartFormData/ContentType.swift
@@ -11,7 +11,7 @@ public struct ContentType: HTTPHeaderField {
     public static let name: String = "Content-Type"
     
     public var value: String {
-        return mediaType._text
+        return mediaType.rawValue
     }
     
     /// The media type (MIME type) of the content type.
@@ -36,6 +36,6 @@ public struct ContentType: HTTPHeaderField {
 extension ContentType {
     internal init(boundary: Boundary) {
         self.mediaType = .multipartFormData
-        self.parameters = [HTTPHeaderParameter("boundary", value: boundary._value)]
+        self.parameters = [HTTPHeaderParameter("boundary", value: boundary.rawValue)]
     }
 }
diff --git a/Sources/MultipartFormData/HTTPHeaderField.swift b/Sources/MultipartFormData/HTTPHeaderField.swift
index 8be70e9..cbffd9f 100644
--- a/Sources/MultipartFormData/HTTPHeaderField.swift
+++ b/Sources/MultipartFormData/HTTPHeaderField.swift
@@ -24,30 +24,31 @@ public protocol HTTPHeaderField: Sendable, Hashable, CustomDebugStringConvertibl
     var parameters: [HTTPHeaderParameter] { get set }
 }
 
-// MARK: - Debug
+// MARK: - CustomDebugStringConvertible
 
 extension HTTPHeaderField {
     /// A textual representation of this instance, suitable for debugging.
     public var debugDescription: String {
-        return _text
+        return rawValue
     }
 }
 
-// MARK: - Helpers
+// MARK: - Data
 
 extension HTTPHeaderField {
-    internal var _value: String {
-        if parameters.isEmpty {
-            return value
-        }
-        return "\(value); \(parameters._text)"
+    /// The actual header field value resulting from ``value`` and ``parameters``.
+    public var parameterizedValue: String {
+        if parameters.isEmpty { return value }
+        return "\(value); \(parameters.rawValue)"
     }
     
-    internal var _text: String {
-        return "\(Self.name): \(_value)"
+    /// The raw string representation of a header field.
+    public var rawValue: String {
+        return "\(Self.name): \(parameterizedValue)"
     }
     
-    internal var _data: Data {
-        return Data(_text.utf8)
+    /// The data representation of a header field.
+    public var data: Data {
+        return Data(rawValue.utf8)
     }
 }
diff --git a/Sources/MultipartFormData/HTTPHeaderParameter.swift b/Sources/MultipartFormData/HTTPHeaderParameter.swift
index 7a0abe3..046d03d 100644
--- a/Sources/MultipartFormData/HTTPHeaderParameter.swift
+++ b/Sources/MultipartFormData/HTTPHeaderParameter.swift
@@ -24,24 +24,26 @@ public struct HTTPHeaderParameter: Sendable, Hashable {
     }
 }
 
-// MARK: - Debug
+// MARK: - CustomDebugStringConvertible
 
 extension HTTPHeaderParameter: CustomDebugStringConvertible {
     public var debugDescription: String {
-        return _text
+        return rawValue
     }
 }
 
-// MARK: - Helpers
+// MARK: - Data
 
 extension HTTPHeaderParameter {
-    internal var _text: String {
+    /// The raw string representation of a header parameter.
+    public var rawValue: String {
         return "\(name)=\"\(value)\""
     }
 }
 
 extension Array<HTTPHeaderParameter> {
-    internal var _text: String {
-        return map(\._text).joined(separator: "; ")
+    /// The raw string representation of multiple header parameters.
+    public var rawValue: String {
+        return map(\.rawValue).joined(separator: "; ")
     }
 }
diff --git a/Sources/MultipartFormData/MediaType.swift b/Sources/MultipartFormData/MediaType.swift
index 0ca30d3..428f1bd 100644
--- a/Sources/MultipartFormData/MediaType.swift
+++ b/Sources/MultipartFormData/MediaType.swift
@@ -87,23 +87,24 @@ extension UTType {
     /// - Parameter mediaType: The media type.
     /// - Parameter supertype: Another UTType instance that the resulting type must conform to; for example, UTTypeData.
     public init?(mediaType: MediaType, conformingTo supertype: UTType = .data) {
-        self.init(mimeType: mediaType._text, conformingTo: supertype)
+        self.init(mimeType: mediaType.rawValue, conformingTo: supertype)
     }
 }
 #endif
 
-// MARK: - Debug
+// MARK: - CustomDebugStringConvertible
 
 extension MediaType: CustomDebugStringConvertible {
     public var debugDescription: String {
-        return _text
+        return rawValue
     }
 }
 
-// MARK: - Helpers
+// MARK: - Data
 
 extension MediaType {
-    internal var _text: String {
+    /// The raw string representation of a media type.
+    public var rawValue: String {
         return "\(type)/\(subtype)"
     }
 }
diff --git a/Sources/MultipartFormData/MultipartFormData.swift b/Sources/MultipartFormData/MultipartFormData.swift
index f8dac25..7912ed1 100644
--- a/Sources/MultipartFormData/MultipartFormData.swift
+++ b/Sources/MultipartFormData/MultipartFormData.swift
@@ -116,7 +116,7 @@ extension MultipartFormData {
     /// This combines all the data from the subparts into one big data object.
     public var httpBody: Data {
         let bodyData: Data = body
-            .map { ._dash + boundary._asciiData + ._crlf + $0._data + ._crlf }
+            .map { ._dash + boundary._asciiData + ._crlf + $0.data + ._crlf }
             .reduce(Data(), +)
         return bodyData + ._dash + boundary._asciiData + ._dash + ._crlf
     }
@@ -158,11 +158,11 @@ extension MultipartFormData {
     }
 }
 
-// MARK: - Debug
+// MARK: - CustomDebugStringConvertible
 
 extension MultipartFormData: CustomDebugStringConvertible {
     public var debugDescription: String {
-        let bytes: Data = contentType._data + ._crlf + ._crlf + httpBody
+        let bytes: Data = contentType.data + ._crlf + ._crlf + httpBody
         return String(bytes: bytes, encoding: .utf8) ?? ""
     }
 }
diff --git a/Sources/MultipartFormData/Subpart.swift b/Sources/MultipartFormData/Subpart.swift
index c88e7c7..992d0f1 100644
--- a/Sources/MultipartFormData/Subpart.swift
+++ b/Sources/MultipartFormData/Subpart.swift
@@ -76,19 +76,20 @@ extension Subpart {
     }
 }
 
-// MARK: - Debug
+// MARK: - CustomDebugStringConvertible
 
 extension Subpart: CustomDebugStringConvertible {
     public var debugDescription: String {
-        return String(bytes: _data, encoding: .utf8) ?? ""
+        return String(bytes: data, encoding: .utf8) ?? ""
     }
 }
 
-// MARK: - Helpers
+// MARK: - Data
 
 extension Subpart {
-    internal var _data: Data {
-        let contentTypeData: Data = contentType.map { $0._data + ._crlf } ?? Data()
-        return contentDisposition._data + ._crlf + contentTypeData + ._crlf + body
+    /// The data representation of a subpart.
+    public var data: Data {
+        let contentTypeData: Data = contentType.map { $0.data + ._crlf } ?? Data()
+        return contentDisposition.data + ._crlf + contentTypeData + ._crlf + body
     }
 }
diff --git a/Sources/MultipartFormData/URLRequest+MultipartFormData.swift b/Sources/MultipartFormData/URLRequest+MultipartFormData.swift
index 39099f9..fe72100 100644
--- a/Sources/MultipartFormData/URLRequest+MultipartFormData.swift
+++ b/Sources/MultipartFormData/URLRequest+MultipartFormData.swift
@@ -33,6 +33,6 @@ extension URLRequest {
     /// Updates the corresponding header field with a``HTTPHeaderField`` object.
     /// - Parameter headerField: The new header field object.
     public mutating func updateHeaderField<Field: HTTPHeaderField>(with headerField: Field) {
-        setValue(headerField._value, forHTTPHeaderField: Field.name)
+        setValue(headerField.parameterizedValue, forHTTPHeaderField: Field.name)
     }
 }
diff --git a/Tests/MultipartFormDataTests/BoundaryTests.swift b/Tests/MultipartFormDataTests/BoundaryTests.swift
index dd2c11e..3ed5247 100644
--- a/Tests/MultipartFormDataTests/BoundaryTests.swift
+++ b/Tests/MultipartFormDataTests/BoundaryTests.swift
@@ -45,7 +45,7 @@ final class BoundaryTests: XCTestCase {
             let randomBoundary = Boundary.random()
             let asciiString = String(data: randomBoundary._asciiData, encoding: .ascii)
             XCTAssertNotNil(asciiString)
-            XCTAssertEqual(asciiString, randomBoundary._value)
+            XCTAssertEqual(asciiString, randomBoundary.rawValue)
         }
     }
     
diff --git a/Tests/MultipartFormDataTests/ContentDispositionTests.swift b/Tests/MultipartFormDataTests/ContentDispositionTests.swift
index 227fd89..fd34b6a 100644
--- a/Tests/MultipartFormDataTests/ContentDispositionTests.swift
+++ b/Tests/MultipartFormDataTests/ContentDispositionTests.swift
@@ -39,6 +39,6 @@ final class ContentDispositionTests: XCTestCase {
     
     func testData() throws {
         let contentDisposition = ContentDisposition(name: "a", filename: "a")
-        XCTAssertEqual(contentDisposition._data, Data("Content-Disposition: form-data; name=\"a\"; filename=\"a\"".utf8))
+        XCTAssertEqual(contentDisposition.data, Data("Content-Disposition: form-data; name=\"a\"; filename=\"a\"".utf8))
     }
 }
diff --git a/Tests/MultipartFormDataTests/ContentTypeTests.swift b/Tests/MultipartFormDataTests/ContentTypeTests.swift
index 00afb3c..c38ff89 100644
--- a/Tests/MultipartFormDataTests/ContentTypeTests.swift
+++ b/Tests/MultipartFormDataTests/ContentTypeTests.swift
@@ -11,13 +11,11 @@ import XCTest
 final class ContentTypeTests: XCTestCase {
     func testBoundaryParameters() throws {
         let contentType = ContentType(boundary: try Boundary(uncheckedBoundary: "test"))
-        
         XCTAssertEqual(contentType.parameters[0], HTTPHeaderParameter("boundary", value: "test"))
     }
     
     func testData() {
         let contentType = ContentType(mediaType: .textPlain, parameters: [HTTPHeaderParameter("test", value: "a")])
-        
-        XCTAssertEqual(contentType._data, Data("Content-Type: text/plain; test=\"a\"".utf8))
+        XCTAssertEqual(contentType.data, Data("Content-Type: text/plain; test=\"a\"".utf8))
     }
 }
diff --git a/Tests/MultipartFormDataTests/HTTPHeaderParameterTests.swift b/Tests/MultipartFormDataTests/HTTPHeaderParameterTests.swift
index be76ad0..717855e 100644
--- a/Tests/MultipartFormDataTests/HTTPHeaderParameterTests.swift
+++ b/Tests/MultipartFormDataTests/HTTPHeaderParameterTests.swift
@@ -9,23 +9,22 @@ import XCTest
 @testable import MultipartFormData
 
 final class HTTPHeaderParameterTests: XCTestCase {
-    func testArrayText() {
+    func testArrayRawValue() {
         let singleParameter = [
             HTTPHeaderParameter("test", value: "a")
         ]
-        XCTAssertEqual(singleParameter._text, "test=\"a\"")
+        XCTAssertEqual(singleParameter.rawValue, "test=\"a\"")
         
         let parameters = [
             HTTPHeaderParameter("test", value: "a"),
             HTTPHeaderParameter("test", value: "a"),
             HTTPHeaderParameter("test", value: "a"),
         ]
-        XCTAssertEqual(parameters._text, "test=\"a\"; test=\"a\"; test=\"a\"")
+        XCTAssertEqual(parameters.rawValue, "test=\"a\"; test=\"a\"; test=\"a\"")
     }
     
     func testDebugDescription() {
         let parameter = HTTPHeaderParameter("test", value: "a")
-        
         let expectedDescription = "test=\"a\""
         XCTAssertEqual(parameter.debugDescription, expectedDescription)
     }
diff --git a/Tests/MultipartFormDataTests/MediaTypeTests.swift b/Tests/MultipartFormDataTests/MediaTypeTests.swift
index 1cde915..9bbaa23 100644
--- a/Tests/MultipartFormDataTests/MediaTypeTests.swift
+++ b/Tests/MultipartFormDataTests/MediaTypeTests.swift
@@ -12,14 +12,13 @@ import UniformTypeIdentifiers
 @testable import MultipartFormData
 
 final class MediaTypeTests: XCTestCase {
-    func testText() {
+    func testRawValue() {
         let mediaType = MediaType(type: "type", subtype: "subtype")
-        XCTAssertEqual(mediaType._text, "type/subtype")
+        XCTAssertEqual(mediaType.rawValue, "type/subtype")
     }
     
     func testDebugDescription() {
         let mediaType = MediaType(type: "type", subtype: "subtype")
-        
         let expectedDescription = "type/subtype"
         XCTAssertEqual(mediaType.debugDescription, expectedDescription)
     }
@@ -29,14 +28,12 @@ final class MediaTypeTests: XCTestCase {
     func testFromUTTypeConversion() throws {
         let uniformType = try XCTUnwrap(UTType("public.comma-separated-values-text"))
         let mediaType = try XCTUnwrap(MediaType(uniformType: uniformType))
-        
         XCTAssertEqual(mediaType, .textCsv)
     }
     
     @available(macOS 11.0, iOS 14.0, watchOS 7.0, tvOS 14.0, *)
     func testToUTTypeConversion() throws {
         let uniformType = try XCTUnwrap(UTType(mediaType: .applicationJson))
-        
         XCTAssertEqual(uniformType.identifier, "public.json")
     }
 #endif
diff --git a/Tests/MultipartFormDataTests/MultipartFormDataTests.swift b/Tests/MultipartFormDataTests/MultipartFormDataTests.swift
index 4a89670..982a901 100644
--- a/Tests/MultipartFormDataTests/MultipartFormDataTests.swift
+++ b/Tests/MultipartFormDataTests/MultipartFormDataTests.swift
@@ -12,7 +12,7 @@ final class MultipartFormDataTests: XCTestCase {
     func testContentType() throws {
         let boundary = try Boundary(uncheckedBoundary: "test")
         let multipartFormData = MultipartFormData(boundary: boundary)
-        XCTAssertEqual(multipartFormData.contentType._data, Data("Content-Type: multipart/form-data; boundary=\"test\"".utf8))
+        XCTAssertEqual(multipartFormData.contentType.data, Data("Content-Type: multipart/form-data; boundary=\"test\"".utf8))
     }
     
     func testHTTPBodyGeneration() throws {
diff --git a/Tests/MultipartFormDataTests/SubpartTests.swift b/Tests/MultipartFormDataTests/SubpartTests.swift
index 8962458..c8e08b6 100644
--- a/Tests/MultipartFormDataTests/SubpartTests.swift
+++ b/Tests/MultipartFormDataTests/SubpartTests.swift
@@ -21,7 +21,7 @@ final class SubpartTests: XCTestCase {
             "",
             "a",
         ].joined(separator: "\r\n").utf8)
-        XCTAssertEqual(subpart._data, expectedData)
+        XCTAssertEqual(subpart.data, expectedData)
     }
     
     func testDebugDescription() {