diff --git a/PhpCollective/Sniffs/Internal/DisallowFunctionsSniff.php b/PhpCollective/Sniffs/Internal/DisallowFunctionsSniff.php
index 1fcdae3..9ce4b4d 100644
--- a/PhpCollective/Sniffs/Internal/DisallowFunctionsSniff.php
+++ b/PhpCollective/Sniffs/Internal/DisallowFunctionsSniff.php
@@ -96,7 +96,7 @@ protected function checkForbiddenFunctions(File $phpcsFile, int $stackPtr): void
         }
 
         $previous = $phpcsFile->findPrevious(T_WHITESPACE, ($stackPtr - 1), null, true);
-        if (!$previous || in_array($tokens[$previous]['code'], static::$wrongTokens, true)) {
+        if ($previous === false || in_array($tokens[$previous]['code'], static::$wrongTokens, true)) {
             return;
         }
 
diff --git a/PhpCollective/Sniffs/PHP/DisallowFunctionsSniff.php b/PhpCollective/Sniffs/PHP/DisallowFunctionsSniff.php
index e0248b5..cb0906b 100644
--- a/PhpCollective/Sniffs/PHP/DisallowFunctionsSniff.php
+++ b/PhpCollective/Sniffs/PHP/DisallowFunctionsSniff.php
@@ -59,7 +59,7 @@ protected function checkForbiddenFunctions(File $phpcsFile, int $stackPtr): void
 
         $tokenContent = $tokens[$stackPtr]['content'];
         $previous = $phpcsFile->findPrevious(T_WHITESPACE, ($stackPtr - 1), null, true);
-        if (!$previous || in_array($tokens[$previous]['code'], static::$wrongTokens)) {
+        if ($previous === false || in_array($tokens[$previous]['code'], static::$wrongTokens)) {
             return;
         }
 
@@ -88,7 +88,7 @@ protected function checkImplodeUsage(File $phpcsFile, int $stackPtr): void
         }
 
         $previous = $phpcsFile->findPrevious(T_WHITESPACE, ($stackPtr - 1), null, true);
-        if (!$previous || in_array($tokens[$previous]['code'], static::$wrongTokens)) {
+        if ($previous === false || in_array($tokens[$previous]['code'], static::$wrongTokens)) {
             return;
         }
 
diff --git a/PhpCollective/Sniffs/PHP/NoIsNullSniff.php b/PhpCollective/Sniffs/PHP/NoIsNullSniff.php
index 618548e..8e1afbc 100644
--- a/PhpCollective/Sniffs/PHP/NoIsNullSniff.php
+++ b/PhpCollective/Sniffs/PHP/NoIsNullSniff.php
@@ -40,7 +40,7 @@ public function process(File $phpcsFile, $stackPtr): void
 
         $tokenContent = $tokens[$stackPtr]['content'];
         $previous = $phpcsFile->findPrevious(T_WHITESPACE, ($stackPtr - 1), null, true);
-        if (!$previous || in_array($tokens[$previous]['code'], $wrongTokens)) {
+        if ($previous === false || in_array($tokens[$previous]['code'], $wrongTokens)) {
             return;
         }
 
diff --git a/PhpCollective/Sniffs/PHP/RemoveFunctionAliasSniff.php b/PhpCollective/Sniffs/PHP/RemoveFunctionAliasSniff.php
index 8a14415..5cdc493 100644
--- a/PhpCollective/Sniffs/PHP/RemoveFunctionAliasSniff.php
+++ b/PhpCollective/Sniffs/PHP/RemoveFunctionAliasSniff.php
@@ -74,7 +74,7 @@ protected function checkFixableAliases(File $phpcsFile, int $stackPtr): void
 
         $tokenContent = $tokens[$stackPtr]['content'];
         $previous = $phpcsFile->findPrevious(T_WHITESPACE, ($stackPtr - 1), null, true);
-        if (!$previous || in_array($tokens[$previous]['code'], $wrongTokens)) {
+        if ($previous === false || in_array($tokens[$previous]['code'], $wrongTokens)) {
             return;
         }
 
diff --git a/PhpCollective/Sniffs/PHP/ShortCastSniff.php b/PhpCollective/Sniffs/PHP/ShortCastSniff.php
index 628a6fe..c414ece 100644
--- a/PhpCollective/Sniffs/PHP/ShortCastSniff.php
+++ b/PhpCollective/Sniffs/PHP/ShortCastSniff.php
@@ -40,7 +40,7 @@ public function process(File $phpcsFile, $stackPtr): void
 
         if ($tokens[$stackPtr]['content'] === '!') {
             $prevIndex = $phpcsFile->findPrevious(T_WHITESPACE, ($stackPtr - 1), null, true);
-            if (!$prevIndex || $tokens[$prevIndex]['content'] !== '!') {
+            if ($prevIndex === false || $tokens[$prevIndex]['content'] !== '!') {
                 return;
             }
 
diff --git a/PhpCollective/Sniffs/WhiteSpace/ImplicitCastSpacingSniff.php b/PhpCollective/Sniffs/WhiteSpace/ImplicitCastSpacingSniff.php
index d3541d6..32d1b74 100644
--- a/PhpCollective/Sniffs/WhiteSpace/ImplicitCastSpacingSniff.php
+++ b/PhpCollective/Sniffs/WhiteSpace/ImplicitCastSpacingSniff.php
@@ -9,6 +9,7 @@
 
 use PHP_CodeSniffer\Files\File;
 use PHP_CodeSniffer\Sniffs\Sniff;
+use PHP_CodeSniffer\Util\Tokens;
 
 /**
  * No whitespace should be between implicit cast and variable, the same as with other casts.
@@ -21,7 +22,7 @@ class ImplicitCastSpacingSniff implements Sniff
      */
     public function register(): array
     {
-        return [T_BOOLEAN_NOT, T_NONE, T_ASPERAND, T_INC, T_DEC];
+        return [T_BOOLEAN_NOT, T_NONE, T_ASPERAND, T_INC, T_DEC, T_MINUS];
     }
 
     /**
@@ -37,6 +38,19 @@ public function process(File $phpcsFile, $stackPtr): void
             return;
         }
 
+        // A minus is only an implicit cast when it negates; as a subtraction it wants its spaces.
+        if ($tokens[$stackPtr]['code'] === T_MINUS) {
+            if (!$this->isUnaryOperator($phpcsFile, $stackPtr)) {
+                return;
+            }
+
+            // `- -$i` must keep its space: closing it up would produce `--$i`, a decrement.
+            $followingIndex = $phpcsFile->findNext(T_WHITESPACE, $stackPtr + 1, null, true);
+            if ($followingIndex !== false && in_array($tokens[$followingIndex]['code'], [T_MINUS, T_DEC], true)) {
+                return;
+            }
+        }
+
         $nextIndex = $phpcsFile->findNext(T_WHITESPACE, $stackPtr + 1, null, true);
 
         if ($nextIndex === false || $nextIndex - $stackPtr === 1) {
@@ -51,6 +65,62 @@ public function process(File $phpcsFile, $stackPtr): void
         }
     }
 
+    /**
+     * A minus is unary only when what precedes it cannot end a value - an operator, an opening
+     * bracket, a comma, `return` and so on.
+     *
+     * The test is deliberately this way round. Listing what may PRECEDE a subtraction instead
+     * would have to enumerate every value-producing token, and anything forgotten (`__LINE__`,
+     * `true`, `null`, a qualified constant) would be read as a negation and "fixed" into
+     * `__LINE__ -1`. Defaulting to binary keeps an unknown predecessor harmless.
+     *
+     * @param \PHP_CodeSniffer\Files\File $phpcsFile
+     * @param int $stackPtr
+     *
+     * @return bool
+     */
+    protected function isUnaryOperator(File $phpcsFile, int $stackPtr): bool
+    {
+        $tokens = $phpcsFile->getTokens();
+
+        $previousIndex = $phpcsFile->findPrevious(Tokens::$emptyTokens, $stackPtr - 1, null, true);
+        if ($previousIndex === false) {
+            return true;
+        }
+
+        $unaryPrefixes = Tokens::$operators
+            + Tokens::$assignmentTokens
+            + Tokens::$comparisonTokens
+            + Tokens::$booleanOperators
+            + Tokens::$castTokens
+            + [
+                T_OPEN_PARENTHESIS => T_OPEN_PARENTHESIS,
+                T_OPEN_SQUARE_BRACKET => T_OPEN_SQUARE_BRACKET,
+                T_OPEN_SHORT_ARRAY => T_OPEN_SHORT_ARRAY,
+                T_OPEN_CURLY_BRACKET => T_OPEN_CURLY_BRACKET,
+                T_COMMA => T_COMMA,
+                T_SEMICOLON => T_SEMICOLON,
+                T_COLON => T_COLON,
+                T_DOUBLE_ARROW => T_DOUBLE_ARROW,
+                T_INLINE_THEN => T_INLINE_THEN,
+                T_INLINE_ELSE => T_INLINE_ELSE,
+                T_RETURN => T_RETURN,
+                T_ECHO => T_ECHO,
+                T_PRINT => T_PRINT,
+                T_CASE => T_CASE,
+                T_BOOLEAN_NOT => T_BOOLEAN_NOT,
+                T_YIELD => T_YIELD,
+                T_YIELD_FROM => T_YIELD_FROM,
+                T_THROW => T_THROW,
+                T_FN_ARROW => T_FN_ARROW,
+                T_MATCH_ARROW => T_MATCH_ARROW,
+                T_OPEN_TAG => T_OPEN_TAG,
+                T_OPEN_TAG_WITH_ECHO => T_OPEN_TAG_WITH_ECHO,
+            ];
+
+        return isset($unaryPrefixes[$tokens[$previousIndex]['code']]);
+    }
+
     /**
      * @param \PHP_CodeSniffer\Files\File $phpcsFile
      * @param int $stackPtr
diff --git a/PhpCollective/ruleset.xml b/PhpCollective/ruleset.xml
index a6d9f9b..e5a84ee 100644
--- a/PhpCollective/ruleset.xml
+++ b/PhpCollective/ruleset.xml
@@ -207,15 +207,16 @@
 
     <rule ref="Squiz.PHP.Eval"/>
     <!--
-        Setting the property replaces the sniff's defaults, so `sizeof` and `delete` have to be
-        repeated here. `create_function` and `each` live here rather than on
+        Setting the property replaces the sniff's defaults, so `delete` has to be repeated
+        here. `create_function` and `each` live here rather than on
         Generic.PHP.DeprecatedFunctions because that sniff builds its list from the running
-        PHP version, where both are long gone.
+        PHP version, where both are long gone. `sizeof` is deliberately NOT listed: it is
+        already reported by PhpCollective.PHP.RemoveFunctionAlias, which unlike this sniff
+        can fix it.
     -->
     <rule ref="Generic.PHP.ForbiddenFunctions">
         <properties>
             <property name="forbiddenFunctions" type="array">
-                <element key="sizeof" value="count"/>
                 <element key="delete" value="unset"/>
                 <element key="create_function" value="null"/>
                 <element key="each" value="null"/>
@@ -234,6 +235,30 @@
         <exclude name="PSR12.Files.FileHeader"/>
         <exclude name="PSR12.Files.DeclareStatement"/>
         <exclude name="PSR12.Files.OpenTag"/>
+        <!-- Long casts are covered by SlevomatCodingStandard.PHP.TypeCast, which catches more. -->
+        <exclude name="PSR12.Keywords.ShortFormTypeKeywords"/>
+    </rule>
+
+    <!--
+        Three rules used to report every long cast. SlevomatCodingStandard.PHP.TypeCast above is
+        the only one that covers all of them - it also rewrites `(double)` to `(float)` and copes
+        with inner spaces like `( boolean )` - so the two narrower ones are silenced here.
+
+        ShortCast matches token content literally and only knows `(boolean)` and `(integer)`; its
+        DoubleNotInvalid check stays on, since nothing else flags `!!`.
+    -->
+    <rule ref="PhpCollective.PHP.ShortCast">
+        <exclude name="PhpCollective.PHP.ShortCast.LongInvalid"/>
+    </rule>
+
+    <!--
+        The incrementer half duplicates Generic.WhiteSpace.IncrementDecrementSpacing, which also
+        handles targets like `$b[0] ++`. The remaining check, spacing after `!`, `@` and friends,
+        has no equivalent and stays on.
+    -->
+    <rule ref="PhpCollective.WhiteSpace.ImplicitCastSpacing">
+        <exclude name="PhpCollective.WhiteSpace.ImplicitCastSpacing.WhitespaceBeforeVariable"/>
+        <exclude name="PhpCollective.WhiteSpace.ImplicitCastSpacing.WhitespaceAfterVariable"/>
     </rule>
 
     <rule ref="SlevomatCodingStandard.Operators.SpreadOperatorSpacing"/>
diff --git a/docs/sniffs.md b/docs/sniffs.md
index 3f29935..d9dd83c 100644
--- a/docs/sniffs.md
+++ b/docs/sniffs.md
@@ -1,7 +1,7 @@
 # PhpCollective Code Sniffer
 
 
-The PhpCollectiveStrict standard contains 251 sniffs
+The PhpCollectiveStrict standard contains 250 sniffs
 
 Generic (27 sniffs)
 -------------------
@@ -163,7 +163,7 @@ PSR2 (12 sniffs)
 - PSR2.Namespaces.NamespaceDeclaration
 - PSR2.Namespaces.UseDeclaration
 
-PSR12 (14 sniffs)
+PSR12 (13 sniffs)
 -----------------
 - PSR12.Classes.AnonClassDeclaration
 - PSR12.Classes.ClassInstantiation
@@ -174,7 +174,6 @@ PSR12 (14 sniffs)
 - PSR12.Files.ImportStatement
 - PSR12.Functions.NullableTypeDeclaration
 - PSR12.Functions.ReturnTypeDeclaration
-- PSR12.Keywords.ShortFormTypeKeywords
 - PSR12.Namespaces.CompoundNamespaceDepth
 - PSR12.Operators.OperatorSpacing
 - PSR12.Properties.ConstantVisibility
diff --git a/tests/_data/ImplicitCastSpacing/after.php b/tests/_data/ImplicitCastSpacing/after.php
index c7448d6..f8432c9 100644
--- a/tests/_data/ImplicitCastSpacing/after.php
+++ b/tests/_data/ImplicitCastSpacing/after.php
@@ -10,15 +10,22 @@ public function run(bool $ready, int $count, int $mask, callable $callable): int
     {
         $not = !$ready;
         $silenced = @$callable();
-        $flipped = ~ $mask;
-        ++$count;
-        $count--;
+        $negated = -$count;
 
+        $flipped = ~ $mask;
         $validNot = !$ready;
         $validSilenced = @$callable();
-        ++$count;
-        $count++;
+        $validNegated = -$count;
+        $validSubtraction = $count - $mask;
+        $constantMinus = __LINE__ - 1;
+        $boolMinus = (int)true - 1;
+        $nullMinus = (int)null - 1;
+        $fqcnMinus = \PHP_INT_MAX - 1;
+        $doubleNegated = - -$count;
+        $arrow = fn (): int => -$count;
 
-        return (int)$not + (int)$silenced + $flipped + $count + (int)$validNot + (int)$validSilenced;
+        return (int)$not + (int)$silenced + $negated + $flipped + (int)$validNot
+            + (int)$validSilenced + $validNegated + $validSubtraction
+            + $constantMinus + $boolMinus + $nullMinus + $fqcnMinus + $doubleNegated + $arrow();
     }
 }
diff --git a/tests/_data/ImplicitCastSpacing/before.php b/tests/_data/ImplicitCastSpacing/before.php
index d2f31d9..89be656 100644
--- a/tests/_data/ImplicitCastSpacing/before.php
+++ b/tests/_data/ImplicitCastSpacing/before.php
@@ -10,15 +10,22 @@ public function run(bool $ready, int $count, int $mask, callable $callable): int
     {
         $not = ! $ready;
         $silenced = @ $callable();
-        $flipped = ~ $mask;
-        ++ $count;
-        $count --;
+        $negated = - $count;
 
+        $flipped = ~ $mask;
         $validNot = !$ready;
         $validSilenced = @$callable();
-        ++$count;
-        $count++;
+        $validNegated = -$count;
+        $validSubtraction = $count - $mask;
+        $constantMinus = __LINE__ - 1;
+        $boolMinus = (int)true - 1;
+        $nullMinus = (int)null - 1;
+        $fqcnMinus = \PHP_INT_MAX - 1;
+        $doubleNegated = - -$count;
+        $arrow = fn (): int => - $count;
 
-        return (int)$not + (int)$silenced + $flipped + $count + (int)$validNot + (int)$validSilenced;
+        return (int)$not + (int)$silenced + $negated + $flipped + (int)$validNot
+            + (int)$validSilenced + $validNegated + $validSubtraction
+            + $constantMinus + $boolMinus + $nullMinus + $fqcnMinus + $doubleNegated + $arrow();
     }
 }
diff --git a/tests/_data/ImplicitCastSpacing/before.tokens.php b/tests/_data/ImplicitCastSpacing/before.tokens.php
new file mode 100644
index 0000000..88efc6e
--- /dev/null
+++ b/tests/_data/ImplicitCastSpacing/before.tokens.php
@@ -0,0 +1,62 @@
+<?php
+// T_OPEN_TAG T_WHITESPACE
+
+// T_WHITESPACE
+declare(strict_types=1);
+// T_DECLARE T_OPEN_PARENTHESIS T_STRING T_EQUAL T_LNUMBER T_CLOSE_PARENTHESIS T_SEMICOLON T_WHITESPACE
+
+// T_WHITESPACE
+namespace PhpCollective;
+// T_NAMESPACE T_WHITESPACE T_STRING T_SEMICOLON T_WHITESPACE
+
+// T_WHITESPACE
+class ImplicitCastSpacingExample
+// T_CLASS T_WHITESPACE T_STRING T_WHITESPACE
+{
+// T_OPEN_CURLY_BRACKET T_WHITESPACE
+    public function run(bool $ready, int $count, int $mask, callable $callable): int
+// T_WHITESPACE T_PUBLIC T_WHITESPACE T_FUNCTION T_WHITESPACE T_STRING T_OPEN_PARENTHESIS T_STRING T_WHITESPACE T_VARIABLE T_COMMA T_WHITESPACE T_STRING T_WHITESPACE T_VARIABLE T_COMMA T_WHITESPACE T_STRING T_WHITESPACE T_VARIABLE T_COMMA T_WHITESPACE T_CALLABLE T_WHITESPACE T_VARIABLE T_CLOSE_PARENTHESIS T_COLON T_WHITESPACE T_STRING T_WHITESPACE
+    {
+// T_WHITESPACE T_OPEN_CURLY_BRACKET T_WHITESPACE
+        $not = ! $ready;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_BOOLEAN_NOT T_WHITESPACE T_VARIABLE T_SEMICOLON T_WHITESPACE
+        $silenced = @ $callable();
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_ASPERAND T_WHITESPACE T_VARIABLE T_OPEN_PARENTHESIS T_CLOSE_PARENTHESIS T_SEMICOLON T_WHITESPACE
+        $negated = - $count;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_MINUS T_WHITESPACE T_VARIABLE T_SEMICOLON T_WHITESPACE
+
+// T_WHITESPACE
+        $flipped = ~ $mask;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_BITWISE_NOT T_WHITESPACE T_VARIABLE T_SEMICOLON T_WHITESPACE
+        $validNot = !$ready;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_BOOLEAN_NOT T_VARIABLE T_SEMICOLON T_WHITESPACE
+        $validSilenced = @$callable();
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_ASPERAND T_VARIABLE T_OPEN_PARENTHESIS T_CLOSE_PARENTHESIS T_SEMICOLON T_WHITESPACE
+        $validNegated = -$count;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_MINUS T_VARIABLE T_SEMICOLON T_WHITESPACE
+        $validSubtraction = $count - $mask;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_VARIABLE T_WHITESPACE T_MINUS T_WHITESPACE T_VARIABLE T_SEMICOLON T_WHITESPACE
+        $constantMinus = __LINE__ - 1;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_LINE T_WHITESPACE T_MINUS T_WHITESPACE T_LNUMBER T_SEMICOLON T_WHITESPACE
+        $boolMinus = (int)true - 1;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_INT_CAST T_TRUE T_WHITESPACE T_MINUS T_WHITESPACE T_LNUMBER T_SEMICOLON T_WHITESPACE
+        $nullMinus = (int)null - 1;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_INT_CAST T_NULL T_WHITESPACE T_MINUS T_WHITESPACE T_LNUMBER T_SEMICOLON T_WHITESPACE
+        $fqcnMinus = \PHP_INT_MAX - 1;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_NAME_FULLY_QUALIFIED T_WHITESPACE T_MINUS T_WHITESPACE T_LNUMBER T_SEMICOLON T_WHITESPACE
+        $doubleNegated = - -$count;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_MINUS T_WHITESPACE T_MINUS T_VARIABLE T_SEMICOLON T_WHITESPACE
+        $arrow = fn (): int => - $count;
+// T_WHITESPACE T_VARIABLE T_WHITESPACE T_EQUAL T_WHITESPACE T_FN T_WHITESPACE T_OPEN_PARENTHESIS T_CLOSE_PARENTHESIS T_COLON T_WHITESPACE T_STRING T_WHITESPACE T_FN_ARROW T_WHITESPACE T_MINUS T_WHITESPACE T_VARIABLE T_SEMICOLON T_WHITESPACE
+
+// T_WHITESPACE
+        return (int)$not + (int)$silenced + $negated + $flipped + (int)$validNot
+// T_WHITESPACE T_RETURN T_WHITESPACE T_INT_CAST T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_INT_CAST T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_INT_CAST T_VARIABLE T_WHITESPACE
+            + (int)$validSilenced + $validNegated + $validSubtraction
+// T_WHITESPACE T_PLUS T_WHITESPACE T_INT_CAST T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_VARIABLE T_WHITESPACE
+            + $constantMinus + $boolMinus + $nullMinus + $fqcnMinus + $doubleNegated + $arrow();
+// T_WHITESPACE T_PLUS T_WHITESPACE T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_VARIABLE T_WHITESPACE T_PLUS T_WHITESPACE T_VARIABLE T_OPEN_PARENTHESIS T_CLOSE_PARENTHESIS T_SEMICOLON T_WHITESPACE
+    }
+// T_WHITESPACE T_CLOSE_CURLY_BRACKET T_WHITESPACE
+}
+// T_CLOSE_CURLY_BRACKET T_WHITESPACE
\ No newline at end of file