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    (fiber/new func &opt sigmask)

    Create a new fiber with function body func. Can optionally take a set
    of signals to block from the current parent fiber when called. The
    mask is specified as a keyword where each character is used to
    indicate a signal to block. The default sigmask is :y. For example,

    	(fiber/new myfun :e123)

    blocks error signals and user signals 1, 2 and 3. The signals are as

    	a - block all signals 	d - block debug signals 	e - block error
    signals 	t - block termination signals: error + user[0-4] 	u - block
    user signals 	y - block yield signals 	0-9 - block a specific user

    The sigmask argument also can take environment flags. If any mutually
    exclusive flags are present, the last flag takes precedence.

    	i - inherit the environment from the current fiber 	p - the
    environment table's prototype is the current environment table

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