diff --git a/changes/31.4.1.md b/changes/31.4.1.md
new file mode 100644
index 0000000000..fd4b44aee4
--- /dev/null
+++ b/changes/31.4.1.md
@@ -0,0 +1,5 @@
+* Add characters:
+  - IDEOGRAPHIC SPACE (`U+3000`) (#759).
+  - KAYAH LI SIGN CWI (`U+A92E`).
+  - ZERO WIDTH NON-BREAKING SPACE (`U+FEFF`).
+* Add APL form (`APLF`) for `U+25E0` and `U+25E1`, for UIUA.
diff --git a/packages/font-glyphs/src/meta/unicode-knowledge.ptl b/packages/font-glyphs/src/meta/unicode-knowledge.ptl
index 8da0b1c113..3d319d8541 100644
--- a/packages/font-glyphs/src/meta/unicode-knowledge.ptl
+++ b/packages/font-glyphs/src/meta/unicode-knowledge.ptl
@@ -370,6 +370,7 @@ export : define ccmpCombinations : list
 
 	# Retroflex hooks
 	list {0x0053 0x0322} 0xA7C5     # S
+	list {0x0071 0x0322} 0x024B     # q
 	list {0x0073 0x0322} 0x0282     # s
 	list {0x0279 0x0322} 0x027B     # ɹ
 	list {0x027F 0x0322} 0x0285     # ɿ
@@ -378,16 +379,24 @@ export : define ccmpCombinations : list
 	list {0x02E2 0x0322} 0x1DB3     # ˢ
 	list {0xA71D 0x0322} 0x107B9    # ꜝ
 
-	# Long stroke overlays
-	list {0x004F 0x0336} 0xA74A     # O
-	list {0x006F 0x0336} 0xA74B     # o
-
 	# Short stroke overlays
 	list {0x0044 0x0335} 0xA7C7     # D
 	list {0x0053 0x0335} 0xA7C9     # S
 	list {0x0064 0x0335} 0xA7C8     # d
 	list {0x0073 0x0335} 0xA7CA     # s
 
+	# Long stroke overlays
+	list {0x004F 0x0336} 0xA74A     # O
+	list {0x006F 0x0336} 0xA74B     # o
+
+	# Smooth breathings
+	list {0x0041 0x0486} 0xA7BA     # A
+	list {0x0049 0x0486} 0xA7BC     # I
+	list {0x0055 0x0486} 0xA7BE     # U
+	list {0x0061 0x0486} 0xA7BB     # a
+	list {0x0069 0x0486} 0xA7BD     # i
+	list {0x0075 0x0486} 0xA7BF     # u
+
 	# Ring overlays
 	list {0x006C 0x20D8} 0xAB39     # l
 	list {0x2190 0x20D8} 0x2B30     # ←
diff --git a/packages/font-glyphs/src/space/index.ptl b/packages/font-glyphs/src/space/index.ptl
index 25bd7fb875..e00af254bd 100644
--- a/packages/font-glyphs/src/space/index.ptl
+++ b/packages/font-glyphs/src/space/index.ptl
@@ -48,6 +48,7 @@ glyph-block Spaces : begin
 	alias 'invisibleTimes'     0x2062 'zwsp'
 	alias 'invisibleSeparator' 0x2063 'zwsp'
 	alias 'invisiblePlus'      0x2064 'zwsp'
+	alias 'zwnbsp'             0xFEFF 'zwsp'
 
 	create-glyph 'cgj' 0x34F : glyph-proc
 		set-width 0
@@ -71,3 +72,7 @@ glyph-block Spaces : begin
 		create-glyph [MangleName 'emsp'] [MangleUnicode 0x2003] : glyph-proc
 			set-width : if (para.isQuasiProportional && MosaicWidthScalar > 1) UPM MosaicWidth
 		alias [MangleName 'emquad'] [MangleUnicode 0x2001] [MangleName 'emsp']
+
+		if (!para.forceMonospace && MosaicWidthScalar > 1) : begin
+			create-glyph 'idsp' 0x3000 : glyph-proc
+				set-width : if para.isQuasiProportional UPM MosaicWidth
diff --git a/packages/font-glyphs/src/symbol/math/apl.ptl b/packages/font-glyphs/src/symbol/math/apl.ptl
index d77c65236c..02b1156075 100644
--- a/packages/font-glyphs/src/symbol/math/apl.ptl
+++ b/packages/font-glyphs/src/symbol/math/apl.ptl
@@ -292,9 +292,11 @@ glyph-block Symbol-Math-APL : begin
 	LinkAplFormForNwidWwid 'vBarSquare'
 	LinkAplFormForNwidWwid 'zigZagArrow'
 	LinkAplFormForNwidWwid 'uni21CC'
+	LinkAplFormForNwidWwid 'uni2335'
+	LinkAplFormForNwidWwid 'uni238B'
+	LinkAplFormForNwidWwid 'uni25E0'
+	LinkAplFormForNwidWwid 'uni25E1'
 	LinkAplFormForNwidWwid 'uni25F0'
 	LinkAplFormForNwidWwid 'uni25F3'
 	LinkAplFormForNwidWwid 'uni25F4'
-	LinkAplFormForNwidWwid 'uni2335'
-	LinkAplFormForNwidWwid 'uni238B'
 	LinkAplFormForNwidWwid 'uni2682'
diff --git a/packages/font-glyphs/src/symbol/punctuation/ties.ptl b/packages/font-glyphs/src/symbol/punctuation/ties.ptl
index 229ff55a43..9152147f13 100644
--- a/packages/font-glyphs/src/symbol/punctuation/ties.ptl
+++ b/packages/font-glyphs/src/symbol/punctuation/ties.ptl
@@ -24,3 +24,4 @@ glyph-block Symbol-Punctuation-Ties : begin
 	create-glyph "symbolMidTie" : TieShape (- Descender / 3) 2
 	create-glyph "frown" 0x2322 : TieShape (SymbolMid + Descender / 3 + OperatorStroke / 4) 2
 	create-glyph "smile" 0x2323 : TieShape (SymbolMid - Descender / 3 - OperatorStroke / 4) (-2)
+	create-glyph "kali/cwi" 0xA92E : TieShape (XH / 2 + Descender / 3 + OperatorStroke / 4) 2