BREAKING(assert): make unreachable() consistent with @std/assert

[iuioiua]

What's changed

This change changes the format of the error message thrown in unreachable() to consistent with the rest of @std/assert. It also capitalizes the first letter of the error message.

Why this change was made

Previously, the format of the error message unreachable() threw didn't have the message suffix, given by the msg argument, at the end of the message string, which is what the rest of @std/assert. This change was made for consistency.

Migration guide

To migrate, update the logic that handles the error message:

import { unreachable } from "@std/assert/unreachable";

try {
  unreachable("Hello");
} catch (error) {
- if (error.message === "Hello") {
+ if (error.message === "Unreachable: Hello") {
    foo();
  }
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.15%. Comparing base (a5a658f) to head (fa8e6a0).
Report is 1 commits behind head on main.

❗ Current head fa8e6a0 differs from pull request most recent head 57e29d4

Please upload reports for the commit 57e29d4 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4943   +/-   ##
=======================================
  Coverage   92.15%   92.15%           
=======================================
  Files         487      487           
  Lines       38768    38769    +1     
  Branches     5390     5390           
=======================================
+ Hits        35725    35726    +1     
  Misses       2987     2987           
  Partials       56       56           

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[kt3k]

LGTM