Review Time and Symbol methods

- Rename Time#trunc to Time#floor_to (parallels round_to; avoids
  confusion with Ruby's Time#floor). Deprecate trunc.
- Symbol: 14 methods reviewed, all clean, no changes needed

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: trans

HISTORY.md

@@ -101,6 +101,8 @@ Changes:
   * Deprecate `Enumerable#mash` (use `Enumerable#graph` instead).
   * Deprecate `Enumerable#uniq_by` (use `Enumerable#uniq(&block)`, Ruby 1.9.2+).
   * Redefine `String#lchomp` / `#lchomp!` as aliases for `delete_prefix` / `delete_prefix!`.
+  * Rename `Time#trunc` to `Time#floor_to` (parallels `Time#round_to`; avoids confusion
+    with Ruby's `Time#floor` which takes sub-second digit precision). `trunc` deprecated.
   * Fix dead requires for removed `kernel/singleton_class` in Proc and Kernel.
   * Remove misplaced `applique/file_helpers` from core (test infrastructure).
   * Drop unused `test_files` directive from gemspec. (PR#301)

lib/core/facets/time/trunc.rb

@@ -1,15 +1,22 @@
 class Time
 
-  # Truncate time at give range (in seconds).
+  # Truncate time to a given interval in seconds.
+  # Unlike Ruby's Time#floor which takes sub-second digit precision,
+  # this takes an interval in seconds.
   #
   #   t = Time.now
-  #   t = t.trunc(60*60)
+  #   t = t.floor_to(60*60)
   #   t.min #=> 0
   #   t.sec #=> 0
   #
-  def trunc(amount)
-    self - (self.to_i % amount)
+  def floor_to(seconds)
+    self - (self.to_i % seconds)
   end
 
-end
+  # @deprecated Use Time#floor_to instead.
+  def trunc(seconds)
+    warn "Time#trunc is deprecated. Use Time#floor_to instead.", uplevel: 1
+    floor_to(seconds)
+  end
 
+end