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Date: Mon, 28 Jul 2025 11:30:19 +0200
To: "Rowan Tommins [IMSoP]" <imsop.php@rwec.co.uk>
Cc: internals@lists.php.net
Subject: Re: [PHP-DEV] [DISCUSSION] Adding the "is_integer_safe()" function
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From: tim@bastelstu.be (=?UTF-8?Q?Tim_D=C3=BCsterhus?=)

Hi

Am 2025-07-26 15:45, schrieb Rowan Tommins [IMSoP]:
> can_lossless_cast<float>(2 ** 54) === false

That one is incorrect, 2**54 *can* be exactly represented as a `float`. 
The magic 2**53 boundary just means that the difference between 
consecutive representable values becomes larger than `1`.

See: https://float.exposed/0x4350000000000000 and try incrementing or 
decrementing the "Raw Decimal Integer Value".

Best regards
Tim Düsterhus