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The grid (core) ยท console.warn

format must be a spec object or a string; ignoring

Printed by The grid (core), prefixed [lattice], since 1.0.1.

Warnings referenceformat:shape

Identifier
format:shape
Raised by
The grid (core)
Since
1.0.1

What happened

The format property was neither an object nor a string - a number, an array, a function - so it was ignored entirely and the column formats by its type's defaults. The offending value is attached to the console line.

The fix

Give format a spec object or a format string.

Reference

Covered in full at the API reference.