typeIs/typeOf behavior has changed since helm 3.18.0 #30880
Description
With helm 3.18.0, there is a change in typeIs/typeOf gotemplate behavior.
For example in:
https://github.com/oauth2-proxy/manifests/blob/4001c2385dc72990add71437b02e18d7ec7f8ffd/helm/oauth2-proxy/templates/_ingress.tpl#L40-L44
While debugging, we saw that typeOf .servicePort has changed from float64 to json.Number.
This could be a bad practice from the chart (that should probably use KindIs), but this is widely used and could break many charts.
Step to reproduce:
Helm 3.17.3:
$ helm repo add oauth2-proxy https://oauth2-proxy.github.io/manifests
"oauth2-proxy" has been added to your repositories
$ helm version
version.BuildInfo{Version:"v3.17.3", GitCommit:"e4da49785aa6e6ee2b86efd5dd9e43400318262b", GitTreeState:"clean", GoVersion:"go1.23.7"}
$ cat <<EOF | helm template demo oauth2-proxy/oauth2-proxy -f -
{
"ingress": {
"enabled": true,
"hosts": ["demo.fr"]
}
}
EOF
[...]
# Source: oauth2-proxy/templates/ingress.yaml
[...]
spec:
rules:
- host: "demo.fr"
http:
paths:
- path: /
pathType: ImplementationSpecific
backend:
service:
name: demo-oauth2-proxy
port:
number: 80 <==== OKHelm 3.18.0:
$ helm version
version.BuildInfo{Version:"v3.18.0", GitCommit:"cc58e3f5a3aa615c6a86275e6f4444b5fdd3cc4e", GitTreeState:"clean", GoVersion:"go1.24.3"}
$ cat <<EOF | helm template demo oauth2-proxy/oauth2-proxy -f -
{
"ingress": {
"enabled": true,
"hosts": ["demo.fr"]
}
}
EOF
[...]
# Source: oauth2-proxy/templates/ingress.yaml
[...]
spec:
rules:
- host: "demo.fr"
http:
paths:
- path: /
pathType: ImplementationSpecific
backend:
service:
name: demo-oauth2-proxy
port: <======= missing