[czj]

.super-slim.yml was checked for the shape of its sections, not for the values in them. max: "120" on LineLength reported [Error] ArgumentError: comparison of Integer with String failed on line 0 of every template, classes: [close] and attribute_delimiters: "<>" ended in a Ruby backtrace, and enabled: "false", tailwind_classes: maybe and max_line_length: 0 were taken at their word: a rule left on, Tailwind shortcuts on, every line wrapped.

Each value is now checked when the file is read, against the kind of its rule's default, and a wrong one stops lint and format with a usage error that names the setting.

• Rule options: enabled is true or false, max a whole number, classes and attributes a mapping, forbidden_engines a list.
• Formatter settings: max_line_length is a whole number above 0, attribute_delimiters one of (), [], {}, with or without a length.
• Left empty is fine: attributes: with nothing under a preset, and max_line_length: with no value, read as before.
• Unknown names still pass: a rule or an option the linter doesn't know is ignored as before; that is for another pull request.

Proof

Each line is a .super-slim.yml, then what super-slim lint app or super-slim format --check app prints and its exit status, on main and with this change:

.super-slim.yml	main	This change
linters: {LineLength: {max: "20"}}	app/a.slim:0: [Error] ArgumentError: comparison of Integer with String failed, 1	.super-slim.yml: `LineLength: max` must be a whole number, 64
linters: {DeprecatedClasses: {classes: [a, b]}}	can't convert Array into Hash (TypeError) and its backtrace, 1	.super-slim.yml: `DeprecatedClasses: classes` must be a mapping, 64
linters: {EmbeddedEngines: {enabled: true, forbidden_engines: javascript}}	nothing, 0	.super-slim.yml: `EmbeddedEngines: forbidden_engines` must be a list, 64
linters: {LineLength: {enabled: "false"}}	nothing, 0: the rule stays on	.super-slim.yml: `LineLength: enabled` must be true or false, 64
tailwind_classes: maybe	nothing, 0: Tailwind shortcuts are on	.super-slim.yml: `tailwind_classes` must be true or false, 64
format: {max_line_length: "40"}	app/a.slim: ArgumentError: comparison of Integer with String failed, 1	.super-slim.yml: `format: max_line_length` must be a whole number above 0, 64
format: {max_line_length: 0}	app/a.slim, 1: every line wraps	the same message, 64
format: {max_line_length: 40, attribute_delimiters: "<>"}	Invalid attribute_delimiters "<>" (ArgumentError) and its backtrace, 1	.super-slim.yml: `format: attribute_delimiters` must be one of (), [], {}, 64

test/cli_test.rb holds eight of these and the two settings left empty; the test of wrong shapes fails on main.