Support "yes", "1" and "true" for bool values.

.circleci/config.yml

@@ -12,7 +12,7 @@ jobs:
           command: |
             go get -v github.com/jstemmer/go-junit-report
             go get -v -t -d ./...
-            curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s v1.15.0
+            curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s v1.21.0
             mkdir ~/report
           when: always
       - run:

.golangci.yml

@@ -10,6 +10,9 @@ linters:
     - maligned
     - lll
     - gochecknoglobals
+    - wsl
+    - funlen
+    - gocognit
 
 linters-settings:
   govet:

go.mod

@@ -7,3 +7,5 @@ require (
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/stretchr/testify v1.2.2
 )
+
+go 1.13

mapper.go

@@ -217,7 +217,17 @@ func (boolMapper) Decode(ctx *DecodeContext, target reflect.Value) error {
 		token := ctx.Scan.Pop()
 		switch v := token.Value.(type) {
 		case string:
-			target.SetBool(strings.ToLower(v) == "true")
+			v = strings.ToLower(v)
+			switch v {
+			case "true", "1", "yes":
+				target.SetBool(true)
+
+			case "false", "0", "no":
+				target.SetBool(false)
+
+			default:
+				return errors.Errorf("bool value must be true, 1, yes, false, 0 or no but got %q", v)
+			}
 
 		case bool:
 			target.SetBool(v)