--set type-coercion for IP-shaped values is an operator footgun (use --set-string)

[lexfrei]

Problem

talm template --set floatingIP=192.168.1.1 (and talm apply --set ...) feed values through Helm's strvals.ParseInto, which type-coerces ambiguous values. An IP literal like 192.168.1.1 is parsed by Helm as a float-shaped token (multiple dots, no leading +/-). The exact behaviour is library-version-dependent but unsafe by default.

Operators who scripted --set floatingIP=... may get unintended type coercion silently; the chart sees a numeric value where it expected a string, and Sprig's toString round-trip may bake in formatting differences (192.168.1.1 vs 192168.0011 if the parser landed on a float).

Reproduction

talm template -f nodes/node0.yaml --set floatingIP=0700

With the post-#163 chart, the fail-fast validator catches the malformed value:

talm: floatingIP "0700" is not a valid IPv4 / IPv6 literal. Edit values.yaml and re-run.

Without the validator (older preset), the value goes through as an integer literal 700 (octal interpretation suppressed by Sprig's toString, but the type information is already lost).

For numeric-shaped non-IP keys (--set replicas=1.0), Helm's coercion is silent — no validator catches it.

Workaround

Use --set-string for any value where type-stability matters:

talm template -f nodes/node0.yaml --set-string floatingIP=192.168.1.1

--set-string skips type coercion and stores the value as a string verbatim.

Expected

1. Document loudly in the --set help text and README: for IP / hostname / version literals, use --set-string to avoid type coercion. Concrete examples in the help text.
2. (Optional) Detect IP-shaped values in the chart's floatingIP / endpoint validators and coerce-through-toString as the first step, the way PR fix(charts): pin Layer2VIPConfig to subnet-matching link, not default route #163 already does for nil and integer values.

Why this matters

Most operators copy commands from internal runbooks / Slack. A --set floatingIP=10.17.100.10 example will be pasted-and-pasted. Each fork of the value carries the float-coercion risk. Documenting the gotcha + the --set-string escape hatch is one README paragraph.

Surfaced during the dev17 manual test plan exercise (J0-1).