Added

• Added support for referring imported Python names as by from ... import ... (#1154)
• Added the basilisp.url namespace for structured URL manipulation (#1239)
• Added support for proxies (#425)
• Added a :slots meta flag for deftype to disable creation of __slots__ on created types (#1241)
• Added support for f-strings (#922)
• Added the aslice macro to facilitate the use of Python style array[start:stop:step] slicing in Basilisp (#1248)
• Added the IPending interface which is implemented by delays, futures, and promises (#1260)
• Added the basilisp.pprint namespace (#513)

Changed

• Removed implicit support for single-use iterables in sequences, and introduced iterator-seq to explicitly handle them (#1192)
• basilisp.core/str now delegates to the builtin Python str in all cases except for customizing the string output for builtin Python types (#1237)
• Optimised mainstream seq-consuming functions by coercing their inputs into seq upfront (#1234)
• Renamed awith and afor to with-async and for-async for improved clarity (#1248)
• basilisp.main.init will only initialize the runtime environment on the first invocation (#1242)
• Updated support for PyPy to 3.9 and 3.10 (#1265)

Fixed

• Fix a bug where protocols with methods with leading hyphens in method names could not be defined (#1230)
• Fix a bug where attempting to :refer a non-existent Var from another namespace would throw an unhelpful exception (#1231)
• Fixed a bug where (range 0) would return (0) rather than than () as expected (#1258)

New Contributors

• @amano-kenji made their first contribution in #1245
• @ShalokShalom made their first contribution in #1257
• @jf made their first contribution in #1259

Full Changelog: v0.3.8...v0.4.0