Quotes are dropped from namespace in kustomization resource

[shanalily]

When adding 'namespace' with only numeric characters to kustomization resource to be applied to all resources, quotes are dropped somewhere during the namespace transformation and the k8s resource becomes invalid when trying to apply.
This works fine in an older versions of kustomize where enable_kyaml was false by default.

Similar to #3412 and #3440 but for namespace field, so the kyaml fix is probably similar.

Example:

kustomization.yaml

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
namespace: "01234"
resources:
- resources.yaml

resources.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: test
data:
  key: "val"

Expected output

apiVersion: v1
data:
  key: val
kind: ConfigMap
metadata:
  name: test
  namespace: "01234"

Actual output

apiVersion: v1
data:
  key: val
kind: ConfigMap
metadata:
  name: test
  namespace: 668

Kustomize version

{Version:kustomize/v4.4.1 GitCommit:b2d65ddc98e09187a8e38adc27c30bab078c1dbf BuildDate:2021-11-11T23:27:14Z GoOs:darwin GoArch:amd64}

Platform

macOS

Additional context

[k8s-ci-robot]

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[shanalily]

I realized there are similar issues with bool "true" and "false" values in some cases.

Example with bool map key:

kustomization.yaml

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
- resources.yaml
commonLabels:
  key: "01234"

resources.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: test
data:
  key: "val"
  yes: y 
  n: no
  true: trueval

Expected output

apiVersion: v1
data:
  key: val
  "n": "no"
  true: trueval
  "yes": "y"
kind: ConfigMap
metadata:
  labels:
    key: "01234"
  name: test

Actual output

Error: map[string]interface {}{"apiVersion":"v1", "data":map[interface {}]interface {}{true:"trueval", "key":"val", "n":"no", "yes":"y"}, "kind":"ConfigMap", "metadata":map[string]interface {}{"labels":map[string]interface {}{"key":"01234"}, "name":"test"}}: json: unsupported type: map[interface {}]interface {}

Example with bool map key:

kustomization.yaml

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
- resources.yaml
commonLabels:
  key: "01234"

resources.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: test
data:
  key: "val"
  yes: y 
  n: no
  truekey: true

Expected output

apiVersion: v1
data:
  key: val
  "n": "no"
  truekey: "true"
  "yes": "y"
kind: ConfigMap
metadata:
  labels:
    key: "01234"
  name: test

Actual output

apiVersion: v1
data:
  key: val
  "n": "no"
  truekey: true
  "yes": "y"
kind: ConfigMap
metadata:
  labels:
    key: "01234"
  name: test

output of kustomize build . | kubectl apply -f - and kubectl apply -k .:

The request is invalid: patch: Invalid value: "map[data:map[truekey:true truth:<nil>] metadata:map[annotations:map[kubectl.kubernetes.io/last-applied-configuration:{\"apiVersion\":\"v1\",\"data\":{\"key\":\"val\",\"n\":\"no\",\"truekey\":true,\"yes\":\"y\"},\"kind\":\"ConfigMap\",\"metadata\":{\"annotations\":{},\"labels\":{\"key\":\"01234\"},\"name\":\"test\",\"namespace\":\"default\"}}\n]]]": unrecognized type: string

Kustomize version

{Version:kustomize/v4.4.1 GitCommit:b2d65ddc98e09187a8e38adc27c30bab078c1dbf BuildDate:2021-11-11T23:27:14Z GoOs:darwin GoArch:amd64}

kubectl version:

Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.3", GitCommit:"ca643a4d1f7bfe34773c74f79527be4afd95bf39", GitTreeState:"clean", BuildDate:"2021-07-15T20:58:09Z", GoVersion:"go1.16.5", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.7", GitCommit:"1f86634ff08f37e54e8bfcd86bc90b61c98f84d4", GitTreeState:"clean", BuildDate:"2021-11-18T00:11:23Z", GoVersion:"go1.16.10", Compiler:"gc", Platform:"linux/amd64"}

Platform

macOS

Additional context