New features

Include a dataset nyweather scraped from OpenWeatherMap (#2)
list.load now supports text-based progress bar when progress = TRUE which is by default
enabled if over 5 files are to be loaded. (#92)
New function list.names gives a list or vector names by mapping.
New functions list.first and list.last find the first or last list element that meets a
given condition.
New function list.unzip to transform a list of elements with similar structure into a
list of decoupled fields

Improvements

Add error handling in several edge cases. (#18)
list.group now supports grouping by multi-key which produces multi-level list. (#69)
list.load now supports loading from multiple filenames given in character vector. (#74)
list.load is now able to guess the file format even if the file type is not specified. (#76)
list.maps now allows the usage of ..1, ..2, etc. to refer to unnamed arguments. (#80)
list.load now supports merging and ungrouping as means to aggregating loaded results. (#82)
list.stack now uses data.table::setDF to convert data.table to data.frame if
data.table = FALSE, which is done by reference and thus has higher performance.

list.search now takes n as the number of returned vector rather than that of the
elements in all returned vectors, and is now able to jump out when the result set reaches
given capacity. (#47, #84)
Fix how list.table deals with NULL values. (#73)
Fix how wrapper functions deal with default arguments. (#75)
Fix the dynamic scoping issues in list.table. (#86)
list.all and list.any behave the same as all and any respectively when the input is empty. (#87)
One-sided formula does not result in error now. (#89)
list.flatten now preserves names as specified. (#90)
Fix incorrect processing for fallback in list.findi. (#91)
Fix the implementation in list.group working with multi-key. (#93)
Fix incorrect ordering if some entries are multi-valued vectors and others and single-
valued. If list.order and list.sort encounter such situation, they now report
error rather than silently produced unreliable results. (#94)
Fix inconsistencies in list.all, list.any, list.first and list.last.

equal() is removed and related packages are now suggested rather than imported. (#70)
summary.list() is deprecated. (#70)
No longer interprets x -> f(x) as a form a lambda expression. Use x ~ f(x) instead. (#54)
desc(x) is no longer supported in list.sort and list.order. Use -x or (x) instead. (#66)

API Break: list.search now evaluates expression recursively in a list and supports limited lambda expression (only value is defined).
Add equal() function for logical and fuzzy filtering and searching which supports exact equality, atomic equality, inclusion, pattern matching, string-distance tolerance.
Add List() to provide an environment in which most list functions are defined for light-weight chaining that does not reply on external operators.

Add list.join, list.mapv, list.do, list.clean, list.parse
Add vignettes

More new functions