IsFixedPitch data from post table lost on export

[eigilnikolajsen]

When I try to export my monospaced fonts using opentype.js they export with the post table value 'isFixedPitch' of 0 even though the value of the font object is 1 (1 meaning that it is a monospaced font, 0 meaning proportional).

Expected Behavior

the 'isFixedPitch' value should follow the value of the font object's value

Steps to Reproduce (for bugs)

Load a monospaced font in OpenType.js and console.log the font object as well and the font.toTables(). Notice that the 'isFixedPitch' value in the post table is different in the font object and the tables.

Your Environment

• Version used: 1.3.1
• Font used: DM Mono but could be any monospaced font
• Browser Name and version: Chrome Version 115.0.5790.170 (Official Build) (x86_64)
• Operating System and version (desktop or mobile): Desktop
• Link to your project: