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Guile Reference Manual

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18.2.4 Immediate Datatypes

The following datatypes are immediate values; that is, they fit entirely within an SCM value. The SCM_IMP and SCM_NIMP macros will distinguish these from non-immediates; see 18.2.3 Immediates vs Non-immediates for an explanation of the distinction.

Note that the type predicates for immediate values work correctly on any SCM value; you do not need to call SCM_IMP first, to establish that a value is immediate. Integers Characters Booleans Unique Values  

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