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+overview: |
+  Set Delimiter tags are used to change the tag delimiters for all content
+  following the tag in the current compilation unit.
+
+  The tag's content MUST be any two non-whitespace sequences (separated by
+  whitespace) EXCEPT an equals sign ('=') followed by the current closing
+  delimiter.
+
+  Set Delimiter tags SHOULD be treated as standalone when appropriate.
+tests:
+  - name: Pair Behavior
+    desc: The equals sign (used on both sides) should permit delimiter changes.
+    data: { text: 'Hey!' }
+    template: '{{=<% %>=}}(<%text%>)'
+    expected: '(Hey!)'
+
+  - name: Special Characters
+    desc: Characters with special meaning regexen should be valid delimiters.
+    data: { text: 'It worked!' }
+    template: '({{=[ ]=}}[text])'
+    expected: '(It worked!)'
+
+  - name: Sections
+    desc: Delimiters set outside sections should persist.
+    data: { section: true, data: 'I got interpolated.' }
+    template: |
+      [
+      {{#section}}
+        {{data}}
+        |data|
+      {{/section}}
+
+      {{= | | =}}
+      |#section|
+        {{data}}
+        |data|
+      |/section|
+      ]
+    expected: |
+      [
+        I got interpolated.
+        |data|
+
+        {{data}}
+        I got interpolated.
+      ]
+
+  - name: Inverted Sections
+    desc: Delimiters set outside inverted sections should persist.
+    data: { section: false, data: 'I got interpolated.' }
+    template: |
+      [
+      {{^section}}
+        {{data}}
+        |data|
+      {{/section}}
+
+      {{= | | =}}
+      |^section|
+        {{data}}
+        |data|
+      |/section|
+      ]
+    expected: |
+      [
+        I got interpolated.
+        |data|
+
+        {{data}}
+        I got interpolated.
+      ]
+
+  - name: Partial Inheritence
+    desc: Delimiters set in a parent template should not affect a partial.
+    data: { value: 'yes' }
+    partials:
+      include: '.{{value}}.'
+    template: |
+      [ {{>include}} ]
+      {{= | | =}}
+      [ |>include| ]
+    expected: |
+      [ .yes. ]
+      [ .yes. ]
+
+  - name: Post-Partial Behavior
+    desc: Delimiters set in a partial should not affect the parent template.
+    data: { value: 'yes' }
+    partials:
+      include: '.{{value}}. {{= | | =}} .|value|.'
+    template: |
+      [ {{>include}} ]
+      [ .{{value}}.  .|value|. ]
+    expected: |
+      [ .yes.  .yes. ]
+      [ .yes.  .|value|. ]
+
+  # Whitespace Sensitivity
+
+  - name: Surrounding Whitespace
+    desc: Surrounding whitespace should be left untouched.
+    data: { }
+    template: '| {{=@ @=}} |'
+    expected: '|  |'
+
+  - name: Outlying Whitespace (Inline)
+    desc: Whitespace should be left untouched.
+    data: { }
+    template: " | {{=@ @=}}\n"
+    expected: " | \n"
+
+  - name: Standalone Tag
+    desc: Standalone lines should be removed from the template.
+    data: { }
+    template: |
+      Begin.
+      {{=@ @=}}
+      End.
+    expected: |
+      Begin.
+      End.
+
+  - name: Indented Standalone Tag
+    desc: Indented standalone lines should be removed from the template.
+    data: { }
+    template: |
+      Begin.
+        {{=@ @=}}
+      End.
+    expected: |
+      Begin.
+      End.
+
+  - name: Standalone Line Endings
+    desc: '"\r\n" should be considered a newline for standalone tags.'
+    data: { }
+    template: "|\r\n{{= @ @ =}}\r\n|"
+    expected: "|\r\n|"
+
+  - name: Standalone Without Previous Line
+    desc: Standalone tags should not require a newline to precede them.
+    data: { }
+    template: "  {{=@ @=}}\n="
+    expected: "="
+
+  - name: Standalone Without Newline
+    desc: Standalone tags should not require a newline to follow them.
+    data: { }
+    template: "=\n  {{=@ @=}}"
+    expected: "=\n"
+
+  # Whitespace Insensitivity
+
+  - name: Pair with Padding
+    desc: Superfluous in-tag whitespace should be ignored.
+    data: { }
+    template: '|{{= @   @ =}}|'
+    expected: '||'