Add Rindex, RindexFunc, PrefixFunc, and SuffixFunc in slices

[bobg]

This PR adds functions Rindex, RindexFunc, PrefixFunc, and SuffixFunc in the slices package.

[Copilot]

Pull Request Overview

This PR introduces four new functions—Rindex, RindexFunc, PrefixFunc, and SuffixFunc—to the slices package, enhancing slice manipulation capabilities. In addition, the PR updates corresponding tests and adjusts a Consumers callback in another package.

• Adds PrefixFunc, Rindex, RindexFunc, and SuffixFunc with their associated logic.
• Updates slice tests to verify the new functions.
• Modifies a Consumers callback signature in the parallel package to ignore an unused parameter.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
slices/slices.go	Introduces new slice processing functions and internal helper invert.
slices/slice_test.go	Implements tests for PrefixFunc, SuffixFunc, and Rindex.
parallel/parallel_test.go	Updates the Consumers callback with improved parameter usage.

Comments suppressed due to low confidence (2)

slices/slices.go:218

• [nitpick] Consider adding a brief comment to the 'invert' function to clarify that it returns the logical negation of the provided predicate.

func invert[T any](pred func(T) bool) func(T) bool {

parallel/parallel_test.go:60

• [nitpick] Include a comment inside the lambda function to indicate that the second parameter is intentionally ignored.

sendfn, closefn := Consumers(context.Background(), 10, func(_ context.Context, _, val int) error {

[coveralls]

Pull Request Test Coverage Report for Build 15535747019

Details

• 28 of 28 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 91.241%

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Totals
Change from base Build 12770668661:	0.5%
Covered Lines:	500
Relevant Lines:	548

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💛 - Coveralls

[github-actions]

Modver result

This report was generated by Modver,
a Go package and command that helps you obey semantic versioning rules in your Go module.

This PR requires (at least) an increase in your module's minor version number.

no object PrefixFunc in old version of package github.com/bobg/go-generics/v4/slices
  Minor