Fix Instant to be a type not struct. (#37)

Author: Dean Karn

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [5.21.1] - 2023-06-30
+### Fixed
+- Instant type to not be wrapped in a struct but a type itself.
+
 ## [5.21.0] - 2023-06-30
 ### Added
 - Instant type to make working with monotonically increasing times more convenient. 
@@ -66,7 +70,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Added `timext.NanoTime` for fast low level monotonic time with nanosecond precision.
 
-[Unreleased]: https://github.com/go-playground/pkg/compare/v5.21.0...HEAD
+[Unreleased]: https://github.com/go-playground/pkg/compare/v5.21.1...HEAD
+[5.21.0]: https://github.com/go-playground/pkg/compare/v5.21.0..v5.21.1
 [5.21.0]: https://github.com/go-playground/pkg/compare/v5.20.0..v5.21.0
 [5.20.0]: https://github.com/go-playground/pkg/compare/v5.19.0..v5.20.0
 [5.19.0]: https://github.com/go-playground/pkg/compare/v5.18.0..v5.19.0

README.md

@@ -1,6 +1,6 @@
 # pkg
 
-![Project status](https://img.shields.io/badge/version-5.21.0-green.svg)
+![Project status](https://img.shields.io/badge/version-5.21.1-green.svg)
 [![Lint & Test](https://github.com/go-playground/pkg/actions/workflows/go.yml/badge.svg)](https://github.com/go-playground/pkg/actions/workflows/go.yml)
 [![Coverage Status](https://coveralls.io/repos/github/go-playground/pkg/badge.svg?branch=master)](https://coveralls.io/github/go-playground/pkg?branch=master)
 [![GoDoc](https://godoc.org/github.com/go-playground/pkg?status.svg)](https://pkg.go.dev/mod/github.com/go-playground/pkg/v5)

time/instant.go

@@ -8,24 +8,22 @@ import "time"
 // Instant represents a monotonic instant in time.
 //
 // Instants are opaque types that can only be compared with one another and allows measuring of duration.
-type Instant struct {
-	monotonic int64
-}
+type Instant int64
 
 // NewInstant returns a new Instant.
 func NewInstant() Instant {
-	return Instant{monotonic: NanoTime()}
+	return Instant(NanoTime())
 }
 
 // Elapsed returns the duration since the instant was created.
 func (i Instant) Elapsed() time.Duration {
-	return time.Duration(NanoTime() - i.monotonic)
+	return time.Duration(NewInstant() - i)
 }
 
 // Since returns the duration elapsed from another Instant, or zero is that Instant is later than this one.
 func (i Instant) Since(instant Instant) time.Duration {
-	if instant.monotonic > i.monotonic {
+	if instant > i {
 		return 0
 	}
-	return time.Duration(i.monotonic - instant.monotonic)
+	return time.Duration(i - instant)
 }