Add equality set operators

doc/Language/operators.pod6

@@ -58,7 +58,7 @@ assigned to that level (column labeled C<A>), and some exemplary operators
     X | Junctive or      |   \| ^ (\|) (^) (\+) (-) ∪ ⊖ ⊎ ∖
     L | Named unary      |   temp let
     N | Structural infix |   but does <=> leg unicmp cmp coll .. ..^ ^.. ^..^
-    C | Chaining infix   |   != ≠ == < <= ≤ > >= ≥ eq ne lt le gt ge ~~ === eqv !eqv =~= ≅ (elem) (cont) (<) (>) (<=) (>=) (<\+) (>\+) ∈ ∉ ∋ ∌ ⊂ ⊄ ⊃ ⊅ ⊆ ⊈ ⊇ ⊉ ≼ ≽
+    C | Chaining infix   |   != ≠ == < <= ≤ > >= ≥ eq ne lt le gt ge ~~ === eqv !eqv =~= ≅ (elem) (cont) (<) (>) (<=) (>=) (<\+) (>\+) (==) ∈ ∉ ∋ ∌ ≡ ≢ ⊂ ⊄ ⊃ ⊅ ⊆ ⊈ ⊇ ⊉ ≼ ≽
     X | Tight and        |   &&
     X | Tight or         |   \|\| ^^ // min max
     R | Conditional      |   ?? !! ff ff^ ^ff ^ff^ fff fff^ ^fff ^fff^
@@ -2481,6 +2481,38 @@ C<!(elem)>.
 
 C«∉» is codepoint U+2209 (NOT AN ELEMENT OF).
 
+=head2 infix C«≡»
+
+    multi sub infix:<≡>($a,$b --> Bool:D)
+
+X<Set equality operator>
+
+Returns C<True> if C<$a> and C<$b> are B<identical>.  Equivalent to
+C<(==)>.
+
+    =begin code
+    say (1, 2, 3) ≡ (1, 3, 2); # OUTPUT: «True␤»
+    say (1, 2, 3) ≡ (1, 2, 4); # OUTPUT: «False␤»
+    =end code
+
+C«≡» is codepoint U+2261 (IDENTICAL TO).
+
+=head2 infix C«≢»
+
+    multi sub infix:<≢>($a,$b --> Bool:D)
+
+X<Set equality operator>
+
+Returns C<True> if C<$a> and C<$b> are B<not identical>.  Equivalent to
+C<!(==)>.
+
+    =begin code
+    say (1, 2, 3) ≢ (1, 2, 4); # OUTPUT: «True␤»
+    say (1, 2, 3) ≢ (1, 3, 2); # OUTPUT: «False␤»
+    =end code
+
+C«≢» is codepoint U+2262 (NOT IDENTICAL TO).
+
 =head2 infix (cont), infix ∋
 
     multi sub infix:<(cont)>($a,$b --> Bool:D)

doc/Language/setbagmix.pod6

@@ -174,6 +174,18 @@ Returns C<True> if C<$a> is B<not> a B<strict superset> of C<$b>, else C<False>.
 L<More information|/language/operators#infix_⊅>,
 L<Wikipedia definition|https://en.wikipedia.org/wiki/Subset#Definitions>.
 
+=head3 infix (==), infix ≡
+
+Returns C<True> if C<$a> and C<$b> are B<identical>, else C<False>.
+L<More information|/language/operators#infix_≡>,
+L<Wikipedia definition|https://en.wikipedia.org/wiki/Equality_(mathematics)#Equality_in_set_theory>.
+
+=head3 infix ≢
+
+Returns C<True> if C<$a> and C<$b> are B<not identical>, else C<False>.
+L<More information|/language/operators#infix_≢>,
+L<Wikipedia definition|https://en.wikipedia.org/wiki/Equality_(mathematics)#Equality_in_set_theory>.
+
 =head2 Set operators that return a C<QuantHash>
 
 =head3 infix (|), infix ∪

doc/Language/unicode_ascii.pod6

@@ -53,7 +53,7 @@ line), or C<Zp> (Separator, paragraph) property.
 This list contains the single codepoints [and their ASCII
 equivalents] that have a special meaning in Raku.
 
-X<|«>X<|»>X<|×>X<|÷>X<|≤>X<|≥>X<|≠>X<|−>X<|∘>X<|≅>X<|π>X<|τ>X<|𝑒>X<|∞>X<|…>X<|‘>X<|’>X<|‚>X<|“>X<|”>X<|„>X<|｢>X<|｣>X<|⁺>X<|⁻>X<|¯>X<|⁰>X<|¹>X<|²>X<|³>X<|⁴>X<|⁵>X<|⁶>X<|⁷>X<|⁸>X<|⁹>X<|∈>X<|∉>X<|∋>X<|∌>X<|⊆>X<|⊈>X<|⊂>X<|⊄>X<|⊇>X<|⊉>X<|⊃>X<|⊅>X<|≼>X<|≽>X<|∪>X<|∩>X<|∖>X<|⊖>X<|⊍>X<|⊎>
+X<|«>X<|»>X<|×>X<|÷>X<|≤>X<|≥>X<|≠>X<|−>X<|∘>X<|≅>X<|π>X<|τ>X<|𝑒>X<|∞>X<|…>X<|‘>X<|’>X<|‚>X<|“>X<|”>X<|„>X<|｢>X<|｣>X<|⁺>X<|⁻>X<|¯>X<|⁰>X<|¹>X<|²>X<|³>X<|⁴>X<|⁵>X<|⁶>X<|⁷>X<|⁸>X<|⁹>X<|∈>X<|∉>X<|∋>X<|∌>X<|≡>X<|≢>X<|⊆>X<|⊈>X<|⊂>X<|⊄>X<|⊇>X<|⊉>X<|⊃>X<|⊅>X<|≼>X<|≽>X<|∪>X<|∩>X<|∖>X<|⊖>X<|⊍>X<|⊎>
 =table
   Symbol | Codepoint | ASCII      | Remarks
   =======|===========|============|=========================
@@ -98,6 +98,8 @@ X<|«>X<|»>X<|×>X<|÷>X<|≤>X<|≥>X<|≠>X<|−>X<|∘>X<|≅>X<|π>X<|τ>X<
   ∉      |  U+2209   | !(elem)    |
   ∋      |  U+220B   | (cont)     |
   ∌      |  U+220C   | !(cont)    |
+  ≡      |  U+2261   | (==)       |
+  ≢      |  U+2262   | !(==)      |
   ⊆      |  U+2286   | (<=)       |
   ⊈      |  U+2288   | !(<=)      |
   ⊂      |  U+2282   | (<)        |

doc/Language/unicode_entry.pod6

@@ -307,6 +307,8 @@ C<Ctrl-Shift-u> in Bash) then the unicode code point hexadecimal number.
     ∉          U+2209               !(elem)
     ∋          U+220B               (cont)
     ∌          U+220C               !(cont)
+    ≡          U+2261               (==)
+    ≢          U+2262               !(==)
     ⊆          U+2286               (<=)
     ⊈          U+2288               !(<=)
     ⊂          U+2282               (<)