more precise strings

Author: staabm

src/Type/StringType.php

@@ -184,6 +184,9 @@ public function toArrayKey(): Type
 	public function toCoercedArgumentType(bool $strictTypes): Type
 	{
 		if (!$strictTypes) {
+			if ($this->isNumericString()->no()) {
+				return TypeCombinator::union($this, $this->toBoolean());
+			}
 			return TypeCombinator::union($this->toInteger(), $this->toFloat(), $this, $this->toBoolean());
 		}
 

tests/PHPStan/Analyser/nsrt/bug-12393b.php

@@ -160,7 +160,7 @@ public function doFoo(string $s): void
 	public function doBar(): void
 	{
 		$this->foo = 'foo';
-		assertType('0', $this->foo); // should be *NEVER*
+		assertType('*NEVER*', $this->foo);
 	}
 }