I noticed that one more package (Ext Base) added into ext-core.jsb2 project file, however some paths point to "src/ext-core/...", please note that there is no ext-core folder in Ext Core source codes folder.

for example:
"text": "ext-base-begin.js",
"path": "src/ext-core/src/adapter/"

does that means we have to copy 'ext-core' folder from ExtJS codebase into Ext Core "src" folder?
and from Ext Core 3.3, do we have to combine to use ext-base.js and ext-core.js ?