--- Precision.induced_from(number)

    number ʬΥ饹Ѵ̤֤ޤ ǥեȤ
    ϡ㳰 TypeError ȯΤǡMix-in 饹
    Υ᥽åɤɬפޤˡ
    Precision#prec [Precision/prec] Ȥȡ ̵¥롼פˤʤ
    ǽޤ

