package orsetto

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Type nym equivalence for opaque values.

val ck : 'a Cf_type.nym -> Cf_type.opaque -> bool

Use ck n v to test whether n is equivalent to the encapsulated runtime type.

val opt : 'a Cf_type.nym -> Cf_type.opaque -> 'a option

Use opt n v to extract Some v' if n is equivalent to the encapsulated runtime type, otherwise returns None.

val req : 'a Cf_type.nym -> Cf_type.opaque -> 'a

Use opt n v to extract v' if n is equivalent to the encapsulated runtime type, otherwise raises an exception (conventionally Type_error).