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In JavaScript zero is equal to an empty string ( == )
En JavaScript, `0 == ""` da true. No es un bug tuyo: es el doble igual convirtiendo tipos antes de comparar. Hay tres iguales y confundirlos rompe apps de verdad. Un igual (`=`) no compara: asigna, por eso `if (x = 5)` entra siempre. Dos iguales (`==`) comparan después de convertir: `"5" == 5` es true, `0 == false` es true, `null == undefined ...
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