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Doc Bug #79694 Coercion of ints to floats with return types even in strict mode not documented
Submitted: 2020-06-12 01:28 UTC Modified: 2020-06-12 03:34 UTC
From: cxlblm at gmail dot com Assigned:
Status: Verified Package: Scripting Engine problem
PHP Version: 7.4.7 OS: macos 10.15.5
Private report: No CVE-ID: None
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 [2020-06-12 01:28 UTC] cxlblm at gmail dot com 
Description:
------------
We can see https://3v4l.org/tmcO4 
What is the type of numeric constant

Test script:
---------------
<?php
declare(strict_types=1);

function testFloat(): float
{
    return 1;
}

var_dump(is_float(testFloat()));
var_dump(is_float(1));


function testInteger(): int
{
    return 1;
}

var_dump(is_int(testInteger()));
var_dump(is_int(1));

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 [2020-06-12 03:34 UTC] requinix@php.net
-Summary: Whether a numeric constant needs to be an integer +Summary: Coercion of ints to floats with return types even in strict mode not documented -Status: Open +Status: Verified -Type: Bug +Type: Documentation Problem -Package: *General Issues +Package: Scripting Engine problem
 [2020-06-12 03:34 UTC] requinix@php.net 
The type is exactly what it looks like. No tricks.

integers may always be coerced to floats, even with strict_types=1. This is covered in the original RFC but not in the online docs for return types.
https://wiki.php.net/rfc/scalar_type_hints_v5#behaviour_of_strict_type_checks
https://www.php.net/manual/en/functions.returning-values.php#functions.returning-values.type-declaration

Note that section does mention return typing works like argument typing does, and their docs do mention the int->float exception.
https://www.php.net/manual/en/functions.arguments.php#functions.arguments.type-declaration.strict
 
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